556172895618 has 16 divisors (see below), whose sum is σ = 1235939768160. Its totient is φ = 185390965188.

The previous prime is 556172895601. The next prime is 556172895623. The reversal of 556172895618 is 816598271655.

556172895618 is a `hidden beast` number, since 5 + 5 + 6 + 1 + 7 + 2 + 8 + 9 + 5 + 618 = 666.

556172895618 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×556172895618² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5149748980 + ... + 5149749087.

It is an arithmetic number, because the mean of its divisors is an integer number (77246235510).

Almost surely, 2^556172895618 is an apocalyptic number.

556172895618 is an abundant number, since it is smaller than the sum of its proper divisors (679766872542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

556172895618 is a wasteful number, since it uses less digits than its factorization.

556172895618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10299498078 (or 10299498072 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 63.

It can be divided in two parts, 55617 and 2895618, that added together give a triangular number (2951235 = T₂₄₂₉).

The spelling of 556172895618 in words is "five hundred fifty-six billion, one hundred seventy-two million, eight hundred ninety-five thousand, six hundred eighteen".