A:
Positive:
1 x 6435452655 x 12870905311 x 5850411555 x 11700823109 x 5904085545 x 11808171199 x 5367355995 x 107347
Negative:
-1 x -643545265-5 x -128709053-11 x -58504115-55 x -11700823-109 x -5904085-545 x -1180817-1199 x -536735-5995 x -107347
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 643,545,265, 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 | 643,545,265 | |
| -1 | -643,545,265 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 643,545,265.
Example:
1 x 643,545,265 = 643,545,265
and
-1 x -643,545,265 = 643,545,265
Notice both answers equal 643,545,265
With that explanation out of the way, let's continue. Next, we take the number 643,545,265 and divide it by 2:
643,545,265 ÷ 2 = 321,772,632.5
If the quotient is a whole number, then 2 and 321,772,632.5 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 | 643,545,265 | |
| -1 | -643,545,265 |
Now, we try dividing 643,545,265 by 3:
643,545,265 ÷ 3 = 214,515,088.3333
If the quotient is a whole number, then 3 and 214,515,088.3333 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 | 643,545,265 | |
| -1 | -643,545,265 |
Let's try dividing by 4:
643,545,265 ÷ 4 = 160,886,316.25
If the quotient is a whole number, then 4 and 160,886,316.25 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 | 643,545,265 | |
| -1 | 643,545,265 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 109 | 545 | 1,199 | 5,995 | 107,347 | 536,735 | 1,180,817 | 5,904,085 | 11,700,823 | 58,504,115 | 128,709,053 | 643,545,265 |
| -1 | -5 | -11 | -55 | -109 | -545 | -1,199 | -5,995 | -107,347 | -536,735 | -1,180,817 | -5,904,085 | -11,700,823 | -58,504,115 | -128,709,053 | -643,545,265 |
Here are some more numbers to try:
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