56656566 has 12 divisors (see below), whose sum is σ = 122755932. Its totient is φ = 18885516.

The previous prime is 56656507. The next prime is 56656577. The reversal of 56656566 is 66565665.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1573776 + ... + 1573811.

It is an arithmetic number, because the mean of its divisors is an integer number (10229661).

Almost surely, 2^56656566 is an apocalyptic number.

56656566 is an abundant number, since it is smaller than the sum of its proper divisors (66099366).

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

56656566 is a wasteful number, since it uses less digits than its factorization.

56656566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147595 (or 3147592 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 56656566 is about 7527.0555996352. The cubic root of 56656566 is about 384.0756280079.

Subtracting 56656566 from its reverse (66565665), we obtain a palindrome (9909099).

The spelling of 56656566 in words is "fifty-six million, six hundred fifty-six thousand, five hundred sixty-six".