22566 has 8 divisors (see below), whose sum is σ = 45144. Its totient is φ = 7520.

The previous prime is 22549. The next prime is 22567. The reversal of 22566 is 66522.

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

22566 is an admirable number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22567) by changing a digit.

22566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875 + ... + 1886.

It is an arithmetic number, because the mean of its divisors is an integer number (5643).

2²²⁵⁶⁶ is an apocalyptic number.

22566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22572).

22566 is a wasteful number, since it uses less digits than its factorization.

22566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766.

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

The square root of 22566 is about 150.2198389029. The cubic root of 22566 is about 28.2586576435.

Subtracting 22566 from its reverse (66522), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 22566 in words is "twenty-two thousand, five hundred sixty-six".