51815056812 has 24 divisors (see below), whose sum is σ = 122075606016. Its totient is φ = 17103998928.

The previous prime is 51815056753. The next prime is 51815056831. The reversal of 51815056812 is 21865051815.

It is a super-2 number, since 2×51815056812² (a number of 22 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, 20959548 + ... + 20962019.

It is an arithmetic number, because the mean of its divisors is an integer number (5086483584).

Almost surely, 2^51815056812 is an apocalyptic number.

It is an amenable number.

51815056812 is an abundant number, since it is smaller than the sum of its proper divisors (70260549204).

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

51815056812 is a wasteful number, since it uses less digits than its factorization.

51815056812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41921677 (or 41921675 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 42.

The spelling of 51815056812 in words is "fifty-one billion, eight hundred fifteen million, fifty-six thousand, eight hundred twelve".