Convert 1 780 627 290 963 to a Signed Binary (Base 2)

How to convert 1 780 627 290 963(10), a signed base 10 integer number? How to write it as a signed binary code in base 2

What are the required steps to convert base 10 integer
number 1 780 627 290 963 to signed binary code (in base 2)?

  • A signed integer, written in base ten, or a decimal system number, is a number written using the digits 0 through 9 and the sign, which can be positive (+) or negative (-). If positive, the sign is usually not written. A number written in base two, or binary, is a number written using only the digits 0 and 1.

1. Divide the number repeatedly by 2:

Keep track of each remainder.

Stop when you get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 1 780 627 290 963 ÷ 2 = 890 313 645 481 + 1;
  • 890 313 645 481 ÷ 2 = 445 156 822 740 + 1;
  • 445 156 822 740 ÷ 2 = 222 578 411 370 + 0;
  • 222 578 411 370 ÷ 2 = 111 289 205 685 + 0;
  • 111 289 205 685 ÷ 2 = 55 644 602 842 + 1;
  • 55 644 602 842 ÷ 2 = 27 822 301 421 + 0;
  • 27 822 301 421 ÷ 2 = 13 911 150 710 + 1;
  • 13 911 150 710 ÷ 2 = 6 955 575 355 + 0;
  • 6 955 575 355 ÷ 2 = 3 477 787 677 + 1;
  • 3 477 787 677 ÷ 2 = 1 738 893 838 + 1;
  • 1 738 893 838 ÷ 2 = 869 446 919 + 0;
  • 869 446 919 ÷ 2 = 434 723 459 + 1;
  • 434 723 459 ÷ 2 = 217 361 729 + 1;
  • 217 361 729 ÷ 2 = 108 680 864 + 1;
  • 108 680 864 ÷ 2 = 54 340 432 + 0;
  • 54 340 432 ÷ 2 = 27 170 216 + 0;
  • 27 170 216 ÷ 2 = 13 585 108 + 0;
  • 13 585 108 ÷ 2 = 6 792 554 + 0;
  • 6 792 554 ÷ 2 = 3 396 277 + 0;
  • 3 396 277 ÷ 2 = 1 698 138 + 1;
  • 1 698 138 ÷ 2 = 849 069 + 0;
  • 849 069 ÷ 2 = 424 534 + 1;
  • 424 534 ÷ 2 = 212 267 + 0;
  • 212 267 ÷ 2 = 106 133 + 1;
  • 106 133 ÷ 2 = 53 066 + 1;
  • 53 066 ÷ 2 = 26 533 + 0;
  • 26 533 ÷ 2 = 13 266 + 1;
  • 13 266 ÷ 2 = 6 633 + 0;
  • 6 633 ÷ 2 = 3 316 + 1;
  • 3 316 ÷ 2 = 1 658 + 0;
  • 1 658 ÷ 2 = 829 + 0;
  • 829 ÷ 2 = 414 + 1;
  • 414 ÷ 2 = 207 + 0;
  • 207 ÷ 2 = 103 + 1;
  • 103 ÷ 2 = 51 + 1;
  • 51 ÷ 2 = 25 + 1;
  • 25 ÷ 2 = 12 + 1;
  • 12 ÷ 2 = 6 + 0;
  • 6 ÷ 2 = 3 + 0;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

2. Construct the base 2 representation of the positive number:

Take all the remainders starting from the bottom of the list constructed above.

1 780 627 290 963(10) = 1 1001 1110 1001 0101 1010 1000 0011 1011 0101 0011(2)


3. Determine the signed binary number bit length:

  • The base 2 number's actual length, in bits: 41.

  • A signed binary's bit length must be equal to a power of 2, as of:
  • 21 = 2; 22 = 4; 23 = 8; 24 = 16; 25 = 32; 26 = 64; ...
  • The first bit (the leftmost) is reserved for the sign:
  • 0 = positive integer number, 1 = negative integer number

The least number that is:

1) a power of 2

2) and is larger than the actual length, 41,

3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)

=== is: 64.


4. Get the positive binary computer representation on 64 bits (8 Bytes):

If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 64:


1 780 627 290 963(10) Base 10 integer number converted and written as a signed binary code (in base 2):

1 780 627 290 963(10) = 0000 0000 0000 0000 0000 0001 1001 1110 1001 0101 1010 1000 0011 1011 0101 0011

Spaces were used to group digits: for binary, by 4, for decimal, by 3.

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How to convert signed base 10 integers in decimal to binary code system

Follow the steps below to convert a signed base ten integer number to signed binary:

  • 1. In a signed binary, first bit (the leftmost) is reserved for sign: 0 = positive integer number, 1 = positive integer number. If the number to be converted is negative, start with its positive version.
  • 2. Divide repeatedly by 2 the positive integer number keeping track of each remainder. STOP when we get a quotient that is ZERO.
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above. Thus, the last remainder of the divisions becomes the first symbol (the leftmost) of the base two number, while the first remainder becomes the last symbol (the rightmost).
  • 4. Binary numbers represented in computer language have a length of 4, 8, 16, 32, 64, ... bits (power of 2) - if needed, fill in extra '0' bits in front of the base 2 number (to the left), up to the right length; this way the first bit (the leftmost one) is always '0', as for a positive representation.
  • 5. To get the negative reprezentation of the number, simply switch the first bit (the leftmost one), from '0' to '1'.

Example: convert the negative number -63 from decimal system (base ten) to signed binary code system:

  • 1. Start with the positive version of the number: |-63| = 63;
  • 2. Divide repeatedly 63 by 2, keeping track of each remainder, until we get a quotient that is equal to zero:
    • division = quotient + remainder
    • 63 ÷ 2 = 31 + 1
    • 31 ÷ 2 = 15 + 1
    • 15 ÷ 2 = 7 + 1
    • 7 ÷ 2 = 3 + 1
    • 3 ÷ 2 = 1 + 1
    • 1 ÷ 2 = 0 + 1
  • 3. Construct the base 2 representation of the positive number, by taking all the remainders starting from the bottom of the list constructed above:
    63(10) = 11 1111(2)
  • 4. The actual length of base 2 representation number is 6, so the positive binary computer representation length of the signed binary will take in this case 8 bits (the least power of 2 higher than 6) - add extra '0's in front (to the left), up to the required length; this way the first bit (the leftmost one) is to be '0', as for a positive number:
    63(10) = 0011 1111(2)
  • 5. To get the negative integer number representation simply change the first bit (the leftmost), from '0' to '1':
    -63(10) = 1011 1111
  • Number -63(10), signed integer, converted from decimal system (base 10) to signed binary = 1011 1111