556506599991 has 8 divisors (see below), whose sum is σ = 742139989104. Its totient is φ = 370938805440.

The previous prime is 556506599981. The next prime is 556506600031. The reversal of 556506599991 is 199995605655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 556506599991 - 2⁷ = 556506599863 is a prime.

It is a super-3 number, since 3×556506599991³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556506599911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16378840 + ... + 16412781.

It is an arithmetic number, because the mean of its divisors is an integer number (92767498638).

Almost surely, 2^556506599991 is an apocalyptic number.

556506599991 is a deficient number, since it is larger than the sum of its proper divisors (185633389113).

556506599991 is a wasteful number, since it uses less digits than its factorization.

556506599991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32797281.

The product of its (nonzero) digits is 147622500, while the sum is 69.

The spelling of 556506599991 in words is "five hundred fifty-six billion, five hundred six million, five hundred ninety-nine thousand, nine hundred ninety-one".