22665 has 8 divisors (see below), whose sum is σ = 36288. Its totient is φ = 12080.

The previous prime is 22651. The next prime is 22669. The reversal of 22665 is 56622.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22665 - 2⁸ = 22409 is a prime.

It is a plaindrome in base 12 and base 16.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (22669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741 + ... + 770.

It is an arithmetic number, because the mean of its divisors is an integer number (4536).

2²²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

22665 is a deficient number, since it is larger than the sum of its proper divisors (13623).

22665 is a wasteful number, since it uses less digits than its factorization.

22665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its digits is 720, while the sum is 21.

The square root of 22665 is about 150.5489953470. The cubic root of 22665 is about 28.2999221697.

Subtracting from 22665 its product of digits (720), we obtain a triangular number (21945 = T₂₀₉).

The spelling of 22665 in words is "twenty-two thousand, six hundred sixty-five".