51181715120 has 40 divisors (see below), whose sum is σ = 125260517040. Its totient is φ = 19395175680.

The previous prime is 51181715113. The next prime is 51181715173. The reversal of 51181715120 is 2151718115.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51181715120² (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, 16834571 + ... + 16837610.

It is an arithmetic number, because the mean of its divisors is an integer number (3131512926).

Almost surely, 2^51181715120 is an apocalyptic number.

It is an amenable number.

51181715120 is an abundant number, since it is smaller than the sum of its proper divisors (74078801920).

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

51181715120 is a wasteful number, since it uses less digits than its factorization.

51181715120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33672213 (or 33672207 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 32.

The spelling of 51181715120 in words is "fifty-one billion, one hundred eighty-one million, seven hundred fifteen thousand, one hundred twenty".