23566 has 4 divisors (see below), whose sum is σ = 35352. Its totient is φ = 11782.

The previous prime is 23563. The next prime is 23567. The reversal of 23566 is 66532.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 10 and base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5890 + ... + 5893.

It is an arithmetic number, because the mean of its divisors is an integer number (8838).

2²³⁵⁶⁶ is an apocalyptic number.

23566 is a deficient number, since it is larger than the sum of its proper divisors (11786).

23566 is a wasteful number, since it uses less digits than its factorization.

23566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11785.

The product of its digits is 1080, while the sum is 22.

The square root of 23566 is about 153.5122144977. The cubic root of 23566 is about 28.6700614933.

The spelling of 23566 in words is "twenty-three thousand, five hundred sixty-six".