51685558837872 has 40 divisors (see below), whose sum is σ = 133521666680976. Its totient is φ = 17228437072896.

The previous prime is 51685558837853. The next prime is 51685558838033. The reversal of 51685558837872 is 27873885558615.

It is a congruent number.

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, 7990578 + ... + 12931374.

Almost surely, 2^{51685558837872} is an apocalyptic number.

It is an amenable number.

51685558837872 is an abundant number, since it is smaller than the sum of its proper divisors (81836107843104).

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

51685558837872 is a wasteful number, since it uses less digits than its factorization.

51685558837872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158745 (or 5158739 counting only the distinct ones).

The product of its digits is 4515840000, while the sum is 78.

The spelling of 51685558837872 in words is "fifty-one trillion, six hundred eighty-five billion, five hundred fifty-eight million, eight hundred thirty-seven thousand, eight hundred seventy-two".