56565566 has 8 divisors (see below), whose sum is σ = 84907200. Its totient is φ = 28263168.

The previous prime is 56565557. The next prime is 56565599. The reversal of 56565566 is 66556565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5891 + ... + 12158.

It is an arithmetic number, because the mean of its divisors is an integer number (10613400).

Almost surely, 2^56565566 is an apocalyptic number.

56565566 is a deficient number, since it is larger than the sum of its proper divisors (28341634).

56565566 is a wasteful number, since it uses less digits than its factorization.

56565566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19618.

The product of its digits is 810000, while the sum is 44.

The square root of 56565566 is about 7521.0083100606. The cubic root of 56565566 is about 383.8698877400.

Subtracting 56565566 from its reverse (66556565), we obtain a palindrome (9990999).

The spelling of 56565566 in words is "fifty-six million, five hundred sixty-five thousand, five hundred sixty-six".