# 255

## 255 is an odd composite number composed of three prime numbers multiplied together.

What does the number 255 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

255 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 255:

### 3 × 5 × 17

See below for interesting mathematical facts about the number 255 from the Numbermatics database.

### Names of 255

• Cardinal: 255 can be written as Two hundred fifty-five.

### Scientific notation

• Scientific notation: 2.55 × 102

### Factors of 255

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 25

### Divisors of 255

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 432
• Sum of proper divisors (its aliquot sum) s(n): 177
• 255 is a deficient number, because the sum of its proper divisors (177) is less than itself. Its deficiency is 78

### Bases of 255

• Binary: 111111112
• Base-36: 73

### Squares and roots of 255

• 255 squared (2552) is 65025
• 255 cubed (2553) is 16581375
• The square root of 255 is 15.9687194227
• The cube root of 255 is 6.3413257053

### Scales and comparisons

How big is 255?
• 255 seconds is equal to 4 minutes, 15 seconds.
• To count from 1 to 255 would take you about two minutes.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 255 cubic inches would be around 0.5 feet tall.

### Recreational maths with 255

• 255 backwards is 552
• The number of decimal digits it has is: 3
• The sum of 255's digits is 12
• More coming soon!