556644991 has 16 divisors (see below), whose sum is σ = 675108864. Its totient is φ = 448043904.

The previous prime is 556644953. The next prime is 556645007. The reversal of 556644991 is 199446655.

It is not a de Polignac number, because 556644991 - 2²³ = 548256383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556644941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50046 + ... + 60148.

It is an arithmetic number, because the mean of its divisors is an integer number (42194304).

Almost surely, 2^556644991 is an apocalyptic number.

556644991 is a deficient number, since it is larger than the sum of its proper divisors (118463873).

556644991 is a wasteful number, since it uses less digits than its factorization.

556644991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10590.

The product of its digits is 1166400, while the sum is 49.

The square root of 556644991 is about 23593.3251365720. The cubic root of 556644991 is about 822.6076963465.

The spelling of 556644991 in words is "five hundred fifty-six million, six hundred forty-four thousand, nine hundred ninety-one".