56566 has 4 divisors (see below), whose sum is σ = 84852. Its totient is φ = 28282.

The previous prime is 56543. The next prime is 56569. The reversal of 56566 is 66565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66565 = 5 ⋅13313.

It is a plaindrome in base 12.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140 + ... + 14143.

It is an arithmetic number, because the mean of its divisors is an integer number (21213).

2⁵⁶⁵⁶⁶ is an apocalyptic number.

56566 is a deficient number, since it is larger than the sum of its proper divisors (28286).

56566 is a wasteful number, since it uses less digits than its factorization.

56566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28285.

The product of its digits is 5400, while the sum is 28.

The square root of 56566 is about 237.8360780033. The cubic root of 56566 is about 38.3870869486.

Subtracting 56566 from its reverse (66565), we obtain a palindrome (9999).

The spelling of 56566 in words is "fifty-six thousand, five hundred sixty-six".