# 660

## 660 is an even composite number composed of four prime numbers multiplied together.

What does the number 660 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

660 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

## Prime factorization of 660:

### 22 × 3 × 5 × 11

(2 × 2 × 3 × 5 × 11)

See below for interesting mathematical facts about the number 660 from the Numbermatics database.

### Names of 660

• Cardinal: 660 can be written as Six hundred sixty.

### Scientific notation

• Scientific notation: 6.6 × 102

### Factors of 660

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 21

### Divisors of 660

• Number of divisors d(n): 24
• Complete list of divisors:
• Sum of all divisors σ(n): 2016
• Sum of proper divisors (its aliquot sum) s(n): 1356
• 660 is an abundant number, because the sum of its proper divisors (1356) is greater than itself. Its abundance is 696

### Bases of 660

• Binary: 10100101002
• Base-36: IC

### Squares and roots of 660

• 660 squared (6602) is 435600
• 660 cubed (6603) is 287496000
• The square root of 660 is 25.6904651573
• The cube root of 660 is 8.7065876911

### Scales and comparisons

How big is 660?
• 660 seconds is equal to 11 minutes.
• To count from 1 to 660 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 660 cubic inches would be around 0.7 feet tall.

### Recreational maths with 660

• 660 backwards is 066
• 660 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 660's digits is 12
• More coming soon!