# 668

## 668 is an even composite number composed of two prime numbers multiplied together.

What does the number 668 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

668 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

## Prime factorization of 668:

### 22 × 167

(2 × 2 × 167)

See below for interesting mathematical facts about the number 668 from the Numbermatics database.

### Names of 668

• Cardinal: 668 can be written as Six hundred sixty-eight.

### Scientific notation

• Scientific notation: 6.68 × 102

### Factors of 668

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 169

### Divisors of 668

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 1176
• Sum of proper divisors (its aliquot sum) s(n): 508
• 668 is a deficient number, because the sum of its proper divisors (508) is less than itself. Its deficiency is 160

### Bases of 668

• Binary: 10100111002
• Base-36: IK

### Squares and roots of 668

• 668 squared (6682) is 446224
• 668 cubed (6683) is 298077632
• The square root of 668 is 25.8456959667
• The cube root of 668 is 8.7416246389

### Scales and comparisons

How big is 668?
• 668 seconds is equal to 11 minutes, 8 seconds.
• To count from 1 to 668 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 668 cubic inches would be around 0.7 feet tall.

### Recreational maths with 668

• 668 backwards is 866
• The number of decimal digits it has is: 3
• The sum of 668's digits is 20
• More coming soon!