A:
Positive:
1 x 6551502111 x 595591113 x 503961719 x 3448159143 x 458147209 x 313469247 x 2652432717 x 24113
Negative:
-1 x -65515021-11 x -5955911-13 x -5039617-19 x -3448159-143 x -458147-209 x -313469-247 x -265243-2717 x -24113
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 65,515,021, 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 | 65,515,021 | |
| -1 | -65,515,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 65,515,021.
Example:
1 x 65,515,021 = 65,515,021
and
-1 x -65,515,021 = 65,515,021
Notice both answers equal 65,515,021
With that explanation out of the way, let's continue. Next, we take the number 65,515,021 and divide it by 2:
65,515,021 ÷ 2 = 32,757,510.5
If the quotient is a whole number, then 2 and 32,757,510.5 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 | 65,515,021 | |
| -1 | -65,515,021 |
Now, we try dividing 65,515,021 by 3:
65,515,021 ÷ 3 = 21,838,340.3333
If the quotient is a whole number, then 3 and 21,838,340.3333 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 | 65,515,021 | |
| -1 | -65,515,021 |
Let's try dividing by 4:
65,515,021 ÷ 4 = 16,378,755.25
If the quotient is a whole number, then 4 and 16,378,755.25 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 | 65,515,021 | |
| -1 | 65,515,021 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 19 | 143 | 209 | 247 | 2,717 | 24,113 | 265,243 | 313,469 | 458,147 | 3,448,159 | 5,039,617 | 5,955,911 | 65,515,021 |
| -1 | -11 | -13 | -19 | -143 | -209 | -247 | -2,717 | -24,113 | -265,243 | -313,469 | -458,147 | -3,448,159 | -5,039,617 | -5,955,911 | -65,515,021 |
Here are some more numbers to try:
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