51236819172 has 144 divisors (see below), whose sum is σ = 167041929600. Its totient is φ = 12849338880.

The previous prime is 51236819159. The next prime is 51236819177. The reversal of 51236819172 is 27191863215.

51236819172 is a `hidden beast` number, since 512 + 3 + 68 + 1 + 9 + 1 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (51236819177) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 238297 + ... + 399072.

It is an arithmetic number, because the mean of its divisors is an integer number (1160013400).

Almost surely, 2^51236819172 is an apocalyptic number.

It is an amenable number.

51236819172 is an abundant number, since it is smaller than the sum of its proper divisors (115805110428).

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

51236819172 is a wasteful number, since it uses less digits than its factorization.

51236819172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637426 (or 637421 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 51236819172 in words is "fifty-one billion, two hundred thirty-six million, eight hundred nineteen thousand, one hundred seventy-two".