556390666 has 32 divisors (see below), whose sum is σ = 939068928. Its totient is φ = 245488320.

The previous prime is 556390633. The next prime is 556390687. The reversal of 556390666 is 666093655.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62740 + ... + 71056.

It is an arithmetic number, because the mean of its divisors is an integer number (29345904).

Almost surely, 2^556390666 is an apocalyptic number.

556390666 is a deficient number, since it is larger than the sum of its proper divisors (382678262).

556390666 is a wasteful number, since it uses less digits than its factorization.

556390666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8446.

The product of its (nonzero) digits is 874800, while the sum is 46.

The square root of 556390666 is about 23587.9347548699. The cubic root of 556390666 is about 822.4823971128.

The spelling of 556390666 in words is "five hundred fifty-six million, three hundred ninety thousand, six hundred sixty-six".