# 55

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

What does the number 55 look like?

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

55 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 55:

### 5 × 11

See below for interesting mathematical facts about the number 55 from the Numbermatics database.

### Names of 55

• Cardinal: 55 can be written as Fifty-five.

### Scientific notation

• Scientific notation: 5.5 × 101

### Factors of 55

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 16

### Divisors of 55

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 72
• Sum of proper divisors (its aliquot sum) s(n): 17
• 55 is a deficient number, because the sum of its proper divisors (17) is less than itself. Its deficiency is 38

### Bases of 55

• Binary: 1101112
• Base-36: 1J

### Squares and roots of 55

• 55 squared (552) is 3025
• 55 cubed (553) is 166375
• The square root of 55 is 7.4161984871
• The cube root of 55 is 3.8029524607

### Scales and comparisons

How big is 55?
• A cube with a volume of 55 cubic inches would be around 0.3 feet tall.

### Recreational maths with 55

• 55 is the same when its digits are reversed! That makes it a palindromic number.
• The number of decimal digits it has is: 2
• The sum of 55's digits is 10
• More coming soon!