A:
Positive:
1 x 251566555 x 503133131 x 811505109 x 230795155 x 162301545 x 461591489 x 168953379 x 7445
Negative:
-1 x -25156655-5 x -5031331-31 x -811505-109 x -230795-155 x -162301-545 x -46159-1489 x -16895-3379 x -7445
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 25,156,655, 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 | 25,156,655 | |
| -1 | -25,156,655 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,156,655.
Example:
1 x 25,156,655 = 25,156,655
and
-1 x -25,156,655 = 25,156,655
Notice both answers equal 25,156,655
With that explanation out of the way, let's continue. Next, we take the number 25,156,655 and divide it by 2:
25,156,655 ÷ 2 = 12,578,327.5
If the quotient is a whole number, then 2 and 12,578,327.5 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 | 25,156,655 | |
| -1 | -25,156,655 |
Now, we try dividing 25,156,655 by 3:
25,156,655 ÷ 3 = 8,385,551.6667
If the quotient is a whole number, then 3 and 8,385,551.6667 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 | 25,156,655 | |
| -1 | -25,156,655 |
Let's try dividing by 4:
25,156,655 ÷ 4 = 6,289,163.75
If the quotient is a whole number, then 4 and 6,289,163.75 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 | 25,156,655 | |
| -1 | 25,156,655 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 109 | 155 | 545 | 1,489 | 3,379 | 7,445 | 16,895 | 46,159 | 162,301 | 230,795 | 811,505 | 5,031,331 | 25,156,655 |
| -1 | -5 | -31 | -109 | -155 | -545 | -1,489 | -3,379 | -7,445 | -16,895 | -46,159 | -162,301 | -230,795 | -811,505 | -5,031,331 | -25,156,655 |
Here are some more numbers to try:
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