51540324660 has 72 divisors (see below), whose sum is σ = 170551626336. Its totient is φ = 12494623680.

The previous prime is 51540324623. The next prime is 51540324679. The reversal of 51540324660 is 6642304515.

51540324660 is a `hidden beast` number, since 5 + 1 + 5 + 403 + 246 + 6 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13013254 + ... + 13017213.

It is an arithmetic number, because the mean of its divisors is an integer number (2368772588).

Almost surely, 2^51540324660 is an apocalyptic number.

It is an amenable number.

51540324660 is an abundant number, since it is smaller than the sum of its proper divisors (119011301676).

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

51540324660 is a wasteful number, since it uses less digits than its factorization.

51540324660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26030493 (or 26030488 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 51540324660 in words is "fifty-one billion, five hundred forty million, three hundred twenty-four thousand, six hundred sixty".