A:
Positive:
1 x 1662052217 x 2374360313 x 1278501737 x 449203391 x 1826431259 x 641719481 x 3455413367 x 49363
Negative:
-1 x -166205221-7 x -23743603-13 x -12785017-37 x -4492033-91 x -1826431-259 x -641719-481 x -345541-3367 x -49363
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 166,205,221, 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 | 166,205,221 | |
| -1 | -166,205,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 166,205,221.
Example:
1 x 166,205,221 = 166,205,221
and
-1 x -166,205,221 = 166,205,221
Notice both answers equal 166,205,221
With that explanation out of the way, let's continue. Next, we take the number 166,205,221 and divide it by 2:
166,205,221 ÷ 2 = 83,102,610.5
If the quotient is a whole number, then 2 and 83,102,610.5 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 | 166,205,221 | |
| -1 | -166,205,221 |
Now, we try dividing 166,205,221 by 3:
166,205,221 ÷ 3 = 55,401,740.3333
If the quotient is a whole number, then 3 and 55,401,740.3333 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 | 166,205,221 | |
| -1 | -166,205,221 |
Let's try dividing by 4:
166,205,221 ÷ 4 = 41,551,305.25
If the quotient is a whole number, then 4 and 41,551,305.25 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 | 166,205,221 | |
| -1 | 166,205,221 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 37 | 91 | 259 | 481 | 3,367 | 49,363 | 345,541 | 641,719 | 1,826,431 | 4,492,033 | 12,785,017 | 23,743,603 | 166,205,221 |
| -1 | -7 | -13 | -37 | -91 | -259 | -481 | -3,367 | -49,363 | -345,541 | -641,719 | -1,826,431 | -4,492,033 | -12,785,017 | -23,743,603 | -166,205,221 |
Here are some more numbers to try:
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