556309657 has 4 divisors (see below), whose sum is σ = 560690176. Its totient is φ = 551929140.

The previous prime is 556309591. The next prime is 556309661. The reversal of 556309657 is 756903655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556309657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556309667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2190069 + ... + 2190322.

It is an arithmetic number, because the mean of its divisors is an integer number (140172544).

Almost surely, 2^556309657 is an apocalyptic number.

It is an amenable number.

556309657 is a deficient number, since it is larger than the sum of its proper divisors (4380519).

556309657 is a wasteful number, since it uses less digits than its factorization.

556309657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380518.

The product of its (nonzero) digits is 850500, while the sum is 46.

The square root of 556309657 is about 23586.2175221039. The cubic root of 556309657 is about 822.4424780928.

The spelling of 556309657 in words is "five hundred fifty-six million, three hundred nine thousand, six hundred fifty-seven".