Factors of 165
The factors of 165 are 1, 3, 5, 11, 15, 33, 55, 165. It has 8 factors.
Factors of 165
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 165 is a whole number that divides it with nothing left over. You only need to test the numbers up to √165 ≈ 12.85; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 8 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 3 + 5 + 11 + 15 + 33 + 55 + 165 = 288. Without 165 itself that is 123, so 165 is a deficient number.
LaTeX source of the formulas on this page
\[ 165 = 3 \times 5 \times 11 \]
Factor pairs of 165
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 165 | 1 × 165 = 165 |
| 3 | 55 | 3 × 55 = 165 |
| 5 | 33 | 5 × 33 = 165 |
| 11 | 15 | 11 × 15 = 165 |
Questions
What are the factors of 165?
The factors of 165 are 1, 3, 5, 11, 15, 33, 55, 165. It has 8 factors.
What are the prime factors of 165?
3, 5, 11. As a product: 3 × 5 × 11.
How many factors does 165 have?
165 has 8 factors (4 factor pairs).
What is the sum of the factors of 165?
288.
Is 165 a prime number?
No. It is divisible by 3, so 165 = 3 × 55.