A:
Positive:
1 x 2515756111 x 228705113 x 193519723 x 1093807143 x 175927253 x 99437299 x 841393289 x 7649
Negative:
-1 x -25157561-11 x -2287051-13 x -1935197-23 x -1093807-143 x -175927-253 x -99437-299 x -84139-3289 x -7649
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 25,157,561, 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 | 25,157,561 | |
| -1 | -25,157,561 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,157,561.
Example:
1 x 25,157,561 = 25,157,561
and
-1 x -25,157,561 = 25,157,561
Notice both answers equal 25,157,561
With that explanation out of the way, let's continue. Next, we take the number 25,157,561 and divide it by 2:
25,157,561 ÷ 2 = 12,578,780.5
If the quotient is a whole number, then 2 and 12,578,780.5 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 | 25,157,561 | |
| -1 | -25,157,561 |
Now, we try dividing 25,157,561 by 3:
25,157,561 ÷ 3 = 8,385,853.6667
If the quotient is a whole number, then 3 and 8,385,853.6667 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 | 25,157,561 | |
| -1 | -25,157,561 |
Let's try dividing by 4:
25,157,561 ÷ 4 = 6,289,390.25
If the quotient is a whole number, then 4 and 6,289,390.25 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 | 25,157,561 | |
| -1 | 25,157,561 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 23 | 143 | 253 | 299 | 3,289 | 7,649 | 84,139 | 99,437 | 175,927 | 1,093,807 | 1,935,197 | 2,287,051 | 25,157,561 |
| -1 | -11 | -13 | -23 | -143 | -253 | -299 | -3,289 | -7,649 | -84,139 | -99,437 | -175,927 | -1,093,807 | -1,935,197 | -2,287,051 | -25,157,561 |
Here are some more numbers to try:
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