A:
Positive:
1 x 16331272111 x 1484661113 x 12562517143 x 1142047659 x 2478191733 x 942377249 x 225298567 x 19063
Negative:
-1 x -163312721-11 x -14846611-13 x -12562517-143 x -1142047-659 x -247819-1733 x -94237-7249 x -22529-8567 x -19063
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 163,312,721, 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 | 163,312,721 | |
| -1 | -163,312,721 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 163,312,721.
Example:
1 x 163,312,721 = 163,312,721
and
-1 x -163,312,721 = 163,312,721
Notice both answers equal 163,312,721
With that explanation out of the way, let's continue. Next, we take the number 163,312,721 and divide it by 2:
163,312,721 ÷ 2 = 81,656,360.5
If the quotient is a whole number, then 2 and 81,656,360.5 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 | 163,312,721 | |
| -1 | -163,312,721 |
Now, we try dividing 163,312,721 by 3:
163,312,721 ÷ 3 = 54,437,573.6667
If the quotient is a whole number, then 3 and 54,437,573.6667 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 | 163,312,721 | |
| -1 | -163,312,721 |
Let's try dividing by 4:
163,312,721 ÷ 4 = 40,828,180.25
If the quotient is a whole number, then 4 and 40,828,180.25 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 | 163,312,721 | |
| -1 | 163,312,721 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 143 | 659 | 1,733 | 7,249 | 8,567 | 19,063 | 22,529 | 94,237 | 247,819 | 1,142,047 | 12,562,517 | 14,846,611 | 163,312,721 |
| -1 | -11 | -13 | -143 | -659 | -1,733 | -7,249 | -8,567 | -19,063 | -22,529 | -94,237 | -247,819 | -1,142,047 | -12,562,517 | -14,846,611 | -163,312,721 |
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