# 1661

## 1,661 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1661 look like?

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

1661 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 1661:

### 11 × 151

See below for interesting mathematical facts about the number 1661 from the Numbermatics database.

### Names of 1661

• Cardinal: 1661 can be written as One thousand, six hundred sixty-one.

### Scientific notation

• Scientific notation: 1.661 × 103

### Factors of 1661

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 162

### Divisors of 1661

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 1824
• Sum of proper divisors (its aliquot sum) s(n): 163
• 1661 is a deficient number, because the sum of its proper divisors (163) is less than itself. Its deficiency is 1498

### Bases of 1661

• Binary: 110011111012
• Base-36: 1A5

### Squares and roots of 1661

• 1661 squared (16612) is 2758921
• 1661 cubed (16613) is 4582567781
• The square root of 1661 is 40.7553677447
• The cube root of 1661 is 11.8428586047

### Scales and comparisons

How big is 1661?
• 1,661 seconds is equal to 27 minutes, 41 seconds.
• To count from 1 to 1,661 would take you about twenty-seven 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 1661 cubic inches would be around 1 feet tall.

### Recreational maths with 1661

• 1661 is the same when its digits are reversed! That makes it a palindromic number.
• The number of decimal digits it has is: 4
• The sum of 1661's digits is 14
• More coming soon!