51516115164 has 18 divisors (see below), whose sum is σ = 130221291200. Its totient is φ = 17172038376.

The previous prime is 51516115159. The next prime is 51516115171. The reversal of 51516115164 is 46151161515.

51516115164 is a `hidden beast` number, since 515 + 16 + 115 + 16 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1431003199 = 51516115164 / (5 + 1 + 5 + 1 + 6 + 1 + 1 + 5 + 1 + 6 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 715501564 + ... + 715501635.

Almost surely, 2^51516115164 is an apocalyptic number.

It is an amenable number.

51516115164 is an abundant number, since it is smaller than the sum of its proper divisors (78705176036).

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

51516115164 is a wasteful number, since it uses less digits than its factorization.

51516115164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431003209 (or 1431003204 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

Adding to 51516115164 its reverse (46151161515), we get a palindrome (97667276679).

The spelling of 51516115164 in words is "fifty-one billion, five hundred sixteen million, one hundred fifteen thousand, one hundred sixty-four".