51100055556 has 24 divisors (see below), whose sum is σ = 130072869024. Its totient is φ = 15484865280.

The previous prime is 51100055551. The next prime is 51100055593. The reversal of 51100055556 is 65555000115.

51100055556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51100055556² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51100055551) 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, 193560685 + ... + 193560948.

It is an arithmetic number, because the mean of its divisors is an integer number (5419702876).

Almost surely, 2^51100055556 is an apocalyptic number.

It is an amenable number.

51100055556 is an abundant number, since it is smaller than the sum of its proper divisors (78972813468).

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

51100055556 is a wasteful number, since it uses less digits than its factorization.

51100055556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387121651 (or 387121649 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 51100055556 in words is "fifty-one billion, one hundred million, fifty-five thousand, five hundred fifty-six".