A:
Positive:
1 x 1653052155 x 3306104373 x 2264455103 x 1604905365 x 452891515 x 3209814397 x 375957519 x 21985
Negative:
-1 x -165305215-5 x -33061043-73 x -2264455-103 x -1604905-365 x -452891-515 x -320981-4397 x -37595-7519 x -21985
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 165,305,215, 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 | 165,305,215 | |
| -1 | -165,305,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 165,305,215.
Example:
1 x 165,305,215 = 165,305,215
and
-1 x -165,305,215 = 165,305,215
Notice both answers equal 165,305,215
With that explanation out of the way, let's continue. Next, we take the number 165,305,215 and divide it by 2:
165,305,215 ÷ 2 = 82,652,607.5
If the quotient is a whole number, then 2 and 82,652,607.5 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 | 165,305,215 | |
| -1 | -165,305,215 |
Now, we try dividing 165,305,215 by 3:
165,305,215 ÷ 3 = 55,101,738.3333
If the quotient is a whole number, then 3 and 55,101,738.3333 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 | 165,305,215 | |
| -1 | -165,305,215 |
Let's try dividing by 4:
165,305,215 ÷ 4 = 41,326,303.75
If the quotient is a whole number, then 4 and 41,326,303.75 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 | 165,305,215 | |
| -1 | 165,305,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 73 | 103 | 365 | 515 | 4,397 | 7,519 | 21,985 | 37,595 | 320,981 | 452,891 | 1,604,905 | 2,264,455 | 33,061,043 | 165,305,215 |
| -1 | -5 | -73 | -103 | -365 | -515 | -4,397 | -7,519 | -21,985 | -37,595 | -320,981 | -452,891 | -1,604,905 | -2,264,455 | -33,061,043 | -165,305,215 |
Here are some more numbers to try:
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