56521566 has 24 divisors (see below), whose sum is σ = 129667824. Its totient is φ = 17732160.

The previous prime is 56521547. The next prime is 56521567. The reversal of 56521566 is 66512565.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 56521566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56521567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92050 + ... + 92661.

It is an arithmetic number, because the mean of its divisors is an integer number (5402826).

Almost surely, 2^56521566 is an apocalyptic number.

56521566 is an abundant number, since it is smaller than the sum of its proper divisors (73146258).

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

56521566 is a wasteful number, since it uses less digits than its factorization.

56521566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184736 (or 184733 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 56521566 is about 7518.0826013020. The cubic root of 56521566 is about 383.7703297841.

Subtracting 56521566 from its reverse (66512565), we obtain a palindrome (9990999).

The spelling of 56521566 in words is "fifty-six million, five hundred twenty-one thousand, five hundred sixty-six".