51111055992 has 32 divisors (see below), whose sum is σ = 129213349200. Its totient is φ = 16845590784.

The previous prime is 51111055981. The next prime is 51111055993. The reversal of 51111055992 is 29955011115.

It is a super-2 number, since 2×51111055992² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51111055992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111055993) 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, 11962063 + ... + 11966334.

Almost surely, 2^51111055992 is an apocalyptic number.

It is an amenable number.

51111055992 is an abundant number, since it is smaller than the sum of its proper divisors (78102293208).

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

51111055992 is a wasteful number, since it uses less digits than its factorization.

51111055992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23928495 (or 23928491 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 39.

The spelling of 51111055992 in words is "fifty-one billion, one hundred eleven million, fifty-five thousand, nine hundred ninety-two".