A:
Positive:
1 x 665646055 x 1331292117 x 391556585 x 783113233 x 2856851165 x 571373361 x 198053961 x 16805
Negative:
-1 x -66564605-5 x -13312921-17 x -3915565-85 x -783113-233 x -285685-1165 x -57137-3361 x -19805-3961 x -16805
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 66,564,605, 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 | 66,564,605 | |
| -1 | -66,564,605 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 66,564,605.
Example:
1 x 66,564,605 = 66,564,605
and
-1 x -66,564,605 = 66,564,605
Notice both answers equal 66,564,605
With that explanation out of the way, let's continue. Next, we take the number 66,564,605 and divide it by 2:
66,564,605 ÷ 2 = 33,282,302.5
If the quotient is a whole number, then 2 and 33,282,302.5 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 | 66,564,605 | |
| -1 | -66,564,605 |
Now, we try dividing 66,564,605 by 3:
66,564,605 ÷ 3 = 22,188,201.6667
If the quotient is a whole number, then 3 and 22,188,201.6667 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 | 66,564,605 | |
| -1 | -66,564,605 |
Let's try dividing by 4:
66,564,605 ÷ 4 = 16,641,151.25
If the quotient is a whole number, then 4 and 16,641,151.25 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 | 66,564,605 | |
| -1 | 66,564,605 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 233 | 1,165 | 3,361 | 3,961 | 16,805 | 19,805 | 57,137 | 285,685 | 783,113 | 3,915,565 | 13,312,921 | 66,564,605 |
| -1 | -5 | -17 | -85 | -233 | -1,165 | -3,361 | -3,961 | -16,805 | -19,805 | -57,137 | -285,685 | -783,113 | -3,915,565 | -13,312,921 | -66,564,605 |
Here are some more numbers to try:
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