51500118816 has 120 divisors (see below), whose sum is σ = 151899557040. Its totient is φ = 17116935552.

The previous prime is 51500118781. The next prime is 51500118827. The reversal of 51500118816 is 61881100515.

51500118816 is a `hidden beast` number, since 51 + 500 + 11 + 88 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 870795 + ... + 928053.

It is an arithmetic number, because the mean of its divisors is an integer number (1265829642).

Almost surely, 2^51500118816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51500118816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75949778520).

51500118816 is an abundant number, since it is smaller than the sum of its proper divisors (100399438224).

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

51500118816 is a wasteful number, since it uses less digits than its factorization.

51500118816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57628 (or 57611 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 36.

The spelling of 51500118816 in words is "fifty-one billion, five hundred million, one hundred eighteen thousand, eight hundred sixteen".