56505566 has 16 divisors (see below), whose sum is σ = 92307600. Its totient is φ = 25785408.

The previous prime is 56505557. The next prime is 56505607. The reversal of 56505566 is 66550565.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9896 + ... + 14523.

It is an arithmetic number, because the mean of its divisors is an integer number (5769225).

Almost surely, 2^56505566 is an apocalyptic number.

56505566 is a deficient number, since it is larger than the sum of its proper divisors (35802034).

56505566 is a wasteful number, since it uses less digits than its factorization.

56505566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24523.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 56505566 is about 7517.0184248810. The cubic root of 56505566 is about 383.7341140810.

The spelling of 56505566 in words is "fifty-six million, five hundred five thousand, five hundred sixty-six".