# 655

## 655 is an odd composite number composed of two prime numbers multiplied together.

What does the number 655 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

655 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 655:

### 5 × 131

See below for interesting mathematical facts about the number 655 from the Numbermatics database.

### Names of 655

• Cardinal: 655 can be written as Six hundred fifty-five.

### Scientific notation

• Scientific notation: 6.55 × 102

### Factors of 655

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 136

### Divisors of 655

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 792
• Sum of proper divisors (its aliquot sum) s(n): 137
• 655 is a deficient number, because the sum of its proper divisors (137) is less than itself. Its deficiency is 518

### Bases of 655

• Binary: 10100011112
• Base-36: I7

### Squares and roots of 655

• 655 squared (6552) is 429025
• 655 cubed (6553) is 281011375
• The square root of 655 is 25.5929677841
• The cube root of 655 is 8.6845456027

### Scales and comparisons

How big is 655?
• 655 seconds is equal to 10 minutes, 55 seconds.
• To count from 1 to 655 would take you about five 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 655 cubic inches would be around 0.7 feet tall.

### Recreational maths with 655

• 655 backwards is 556
• The number of decimal digits it has is: 3
• The sum of 655's digits is 16
• More coming soon!