51566 has 16 divisors (see below), whose sum is σ = 86400. Its totient is φ = 22968.

The previous prime is 51563. The next prime is 51577. The reversal of 51566 is 66515.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a plaindrome in base 8.

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 (51563) 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, 845 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (5400).

2⁵¹⁵⁶⁶ is an apocalyptic number.

51566 is a deficient number, since it is larger than the sum of its proper divisors (34834).

51566 is a wasteful number, since it uses less digits than its factorization.

51566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103.

The product of its digits is 900, while the sum is 23.

The square root of 51566 is about 227.0814831729. The cubic root of 51566 is about 37.2209809574.

The spelling of 51566 in words is "fifty-one thousand, five hundred sixty-six".