A:
Positive:
1 x 66354252117 x 39031913223 x 2975527383 x 1732487457 x 14519533791 x 1750316511 x 1019117769 x 85409
Negative:
-1 x -663542521-17 x -39031913-223 x -2975527-383 x -1732487-457 x -1451953-3791 x -175031-6511 x -101911-7769 x -85409
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 663,542,521, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 663,542,521 | |
| -1 | -663,542,521 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 663,542,521.
Example:
1 x 663,542,521 = 663,542,521
and
-1 x -663,542,521 = 663,542,521
Notice both answers equal 663,542,521
With that explanation out of the way, let's continue. Next, we take the number 663,542,521 and divide it by 2:
663,542,521 ÷ 2 = 331,771,260.5
If the quotient is a whole number, then 2 and 331,771,260.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 663,542,521 | |
| -1 | -663,542,521 |
Now, we try dividing 663,542,521 by 3:
663,542,521 ÷ 3 = 221,180,840.3333
If the quotient is a whole number, then 3 and 221,180,840.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 663,542,521 | |
| -1 | -663,542,521 |
Let's try dividing by 4:
663,542,521 ÷ 4 = 165,885,630.25
If the quotient is a whole number, then 4 and 165,885,630.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 663,542,521 | |
| -1 | 663,542,521 |
If you did it right, you will end up with this table:
| 1 | 17 | 223 | 383 | 457 | 3,791 | 6,511 | 7,769 | 85,409 | 101,911 | 175,031 | 1,451,953 | 1,732,487 | 2,975,527 | 39,031,913 | 663,542,521 |
| -1 | -17 | -223 | -383 | -457 | -3,791 | -6,511 | -7,769 | -85,409 | -101,911 | -175,031 | -1,451,953 | -1,732,487 | -2,975,527 | -39,031,913 | -663,542,521 |
Here are some more numbers to try:
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