A:
Positive:
1 x 2166555655 x 433311137 x 3095079517 x 1274444535 x 619015985 x 2548889119 x 1820635595 x 364127
Negative:
-1 x -216655565-5 x -43331113-7 x -30950795-17 x -12744445-35 x -6190159-85 x -2548889-119 x -1820635-595 x -364127
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 216,655,565, 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 | 216,655,565 | |
| -1 | -216,655,565 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 216,655,565.
Example:
1 x 216,655,565 = 216,655,565
and
-1 x -216,655,565 = 216,655,565
Notice both answers equal 216,655,565
With that explanation out of the way, let's continue. Next, we take the number 216,655,565 and divide it by 2:
216,655,565 ÷ 2 = 108,327,782.5
If the quotient is a whole number, then 2 and 108,327,782.5 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 | 216,655,565 | |
| -1 | -216,655,565 |
Now, we try dividing 216,655,565 by 3:
216,655,565 ÷ 3 = 72,218,521.6667
If the quotient is a whole number, then 3 and 72,218,521.6667 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 | 216,655,565 | |
| -1 | -216,655,565 |
Let's try dividing by 4:
216,655,565 ÷ 4 = 54,163,891.25
If the quotient is a whole number, then 4 and 54,163,891.25 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 | 216,655,565 | |
| -1 | 216,655,565 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 17 | 35 | 85 | 119 | 595 | 364,127 | 1,820,635 | 2,548,889 | 6,190,159 | 12,744,445 | 30,950,795 | 43,331,113 | 216,655,565 |
| -1 | -5 | -7 | -17 | -35 | -85 | -119 | -595 | -364,127 | -1,820,635 | -2,548,889 | -6,190,159 | -12,744,445 | -30,950,795 | -43,331,113 | -216,655,565 |
Here are some more numbers to try:
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