A:
Positive:
1 x 6672216055 x 13344432123 x 29009635115 x 5801927179 x 3727495895 x 7454994117 x 16206520585 x 32413
Negative:
-1 x -667221605-5 x -133444321-23 x -29009635-115 x -5801927-179 x -3727495-895 x -745499-4117 x -162065-20585 x -32413
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 667,221,605, 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 | 667,221,605 | |
| -1 | -667,221,605 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 667,221,605.
Example:
1 x 667,221,605 = 667,221,605
and
-1 x -667,221,605 = 667,221,605
Notice both answers equal 667,221,605
With that explanation out of the way, let's continue. Next, we take the number 667,221,605 and divide it by 2:
667,221,605 ÷ 2 = 333,610,802.5
If the quotient is a whole number, then 2 and 333,610,802.5 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 | 667,221,605 | |
| -1 | -667,221,605 |
Now, we try dividing 667,221,605 by 3:
667,221,605 ÷ 3 = 222,407,201.6667
If the quotient is a whole number, then 3 and 222,407,201.6667 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 | 667,221,605 | |
| -1 | -667,221,605 |
Let's try dividing by 4:
667,221,605 ÷ 4 = 166,805,401.25
If the quotient is a whole number, then 4 and 166,805,401.25 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 | 667,221,605 | |
| -1 | 667,221,605 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 115 | 179 | 895 | 4,117 | 20,585 | 32,413 | 162,065 | 745,499 | 3,727,495 | 5,801,927 | 29,009,635 | 133,444,321 | 667,221,605 |
| -1 | -5 | -23 | -115 | -179 | -895 | -4,117 | -20,585 | -32,413 | -162,065 | -745,499 | -3,727,495 | -5,801,927 | -29,009,635 | -133,444,321 | -667,221,605 |
Here are some more numbers to try:
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