556921899 has 10 divisors (see below), whose sum is σ = 831945180. Its totient is φ = 371281212.

The previous prime is 556921877. The next prime is 556921903. The reversal of 556921899 is 998129655.

556921899 is a `hidden beast` number, since 556 + 9 + 2 + 1 + 89 + 9 = 666.

It is not a de Polignac number, because 556921899 - 2⁵ = 556921867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556921499) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3437709 + ... + 3437870.

It is an arithmetic number, because the mean of its divisors is an integer number (83194518).

Almost surely, 2^556921899 is an apocalyptic number.

556921899 is a deficient number, since it is larger than the sum of its proper divisors (275023281).

556921899 is an equidigital number, since it uses as much as digits as its factorization.

556921899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875591 (or 6875582 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The square root of 556921899 is about 23599.1927616179. The cubic root of 556921899 is about 822.7440782383.

The spelling of 556921899 in words is "five hundred fifty-six million, nine hundred twenty-one thousand, eight hundred ninety-nine".