A:
Positive:
1 x 151658655 x 303317311 x 137871513 x 116660555 x 27574365 x 233321143 x 106055715 x 21211
Negative:
-1 x -15165865-5 x -3033173-11 x -1378715-13 x -1166605-55 x -275743-65 x -233321-143 x -106055-715 x -21211
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 15,165,865, 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 | 15,165,865 | |
| -1 | -15,165,865 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,165,865.
Example:
1 x 15,165,865 = 15,165,865
and
-1 x -15,165,865 = 15,165,865
Notice both answers equal 15,165,865
With that explanation out of the way, let's continue. Next, we take the number 15,165,865 and divide it by 2:
15,165,865 ÷ 2 = 7,582,932.5
If the quotient is a whole number, then 2 and 7,582,932.5 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 | 15,165,865 | |
| -1 | -15,165,865 |
Now, we try dividing 15,165,865 by 3:
15,165,865 ÷ 3 = 5,055,288.3333
If the quotient is a whole number, then 3 and 5,055,288.3333 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 | 15,165,865 | |
| -1 | -15,165,865 |
Let's try dividing by 4:
15,165,865 ÷ 4 = 3,791,466.25
If the quotient is a whole number, then 4 and 3,791,466.25 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 | 15,165,865 | |
| -1 | 15,165,865 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 13 | 55 | 65 | 143 | 715 | 21,211 | 106,055 | 233,321 | 275,743 | 1,166,605 | 1,378,715 | 3,033,173 | 15,165,865 |
| -1 | -5 | -11 | -13 | -55 | -65 | -143 | -715 | -21,211 | -106,055 | -233,321 | -275,743 | -1,166,605 | -1,378,715 | -3,033,173 | -15,165,865 |
Here are some more numbers to try:
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