56556566 has 16 divisors (see below), whose sum is σ = 93467088. Its totient is φ = 25452000.

The previous prime is 56556553. The next prime is 56556571. The reversal of 56556566 is 66565565.

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, 10505 + ... + 14948.

It is an arithmetic number, because the mean of its divisors is an integer number (5841693).

Almost surely, 2^56556566 is an apocalyptic number.

56556566 is a deficient number, since it is larger than the sum of its proper divisors (36910522).

56556566 is a wasteful number, since it uses less digits than its factorization.

56556566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25567.

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

The square root of 56556566 is about 7520.4099622295. The cubic root of 56556566 is about 383.8495278139.

It can be divided in two parts, 5655 and 6566, that added together give a palindrome (12221).

The spelling of 56556566 in words is "fifty-six million, five hundred fifty-six thousand, five hundred sixty-six".