# 18661

## 18,661 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 18661 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

18661 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 18661:

### 18661

See below for interesting mathematical facts about the number 18661 from the Numbermatics database.

### Names of 18661

• Cardinal: 18661 can be written as Eighteen thousand, six hundred sixty-one.

### Scientific notation

• Scientific notation: 1.8661 × 104

### Factors of 18661

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 18661

### Divisors of 18661

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 18662
• Sum of proper divisors (its aliquot sum) s(n): 1
• 18661 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 18660

### Bases of 18661

• Binary: 1001000111001012
• Base-36: EED

### Squares and roots of 18661

• 18661 squared (186612) is 348232921
• 18661 cubed (186613) is 6498374538781
• The square root of 18661 is 136.6052707623
• The cube root of 18661 is 26.5243634963

### Scales and comparisons

How big is 18661?
• 18,661 seconds is equal to 5 hours, 11 minutes, 1 second.
• To count from 1 to 18,661 would take you about five hours.

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 18661 cubic inches would be around 2.2 feet tall.

### Recreational maths with 18661

• 18661 backwards is 16681
• The number of decimal digits it has is: 5
• The sum of 18661's digits is 22
• More coming soon!