51840685688 has 64 divisors (see below), whose sum is σ = 113347019520. Its totient is φ = 21989651200.

The previous prime is 51840685639. The next prime is 51840685703. The reversal of 51840685688 is 88658604815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229370 + ... + 395337.

It is an arithmetic number, because the mean of its divisors is an integer number (1771047180).

Almost surely, 2^51840685688 is an apocalyptic number.

It is an amenable number.

51840685688 is an abundant number, since it is smaller than the sum of its proper divisors (61506333832).

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

51840685688 is a wasteful number, since it uses less digits than its factorization.

51840685688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624788 (or 624784 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 59.

The spelling of 51840685688 in words is "fifty-one billion, eight hundred forty million, six hundred eighty-five thousand, six hundred eighty-eight".