A:
Positive:
1 x 664010655 x 1328021317 x 390594585 x 781189353 x 1881051765 x 376212213 x 300056001 x 11065
Negative:
-1 x -66401065-5 x -13280213-17 x -3905945-85 x -781189-353 x -188105-1765 x -37621-2213 x -30005-6001 x -11065
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 66,401,065, 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 | 66,401,065 | |
| -1 | -66,401,065 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 66,401,065.
Example:
1 x 66,401,065 = 66,401,065
and
-1 x -66,401,065 = 66,401,065
Notice both answers equal 66,401,065
With that explanation out of the way, let's continue. Next, we take the number 66,401,065 and divide it by 2:
66,401,065 ÷ 2 = 33,200,532.5
If the quotient is a whole number, then 2 and 33,200,532.5 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 | 66,401,065 | |
| -1 | -66,401,065 |
Now, we try dividing 66,401,065 by 3:
66,401,065 ÷ 3 = 22,133,688.3333
If the quotient is a whole number, then 3 and 22,133,688.3333 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 | 66,401,065 | |
| -1 | -66,401,065 |
Let's try dividing by 4:
66,401,065 ÷ 4 = 16,600,266.25
If the quotient is a whole number, then 4 and 16,600,266.25 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 | 66,401,065 | |
| -1 | 66,401,065 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 353 | 1,765 | 2,213 | 6,001 | 11,065 | 30,005 | 37,621 | 188,105 | 781,189 | 3,905,945 | 13,280,213 | 66,401,065 |
| -1 | -5 | -17 | -85 | -353 | -1,765 | -2,213 | -6,001 | -11,065 | -30,005 | -37,621 | -188,105 | -781,189 | -3,905,945 | -13,280,213 | -66,401,065 |
Here are some more numbers to try:
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