51685516642828 has 12 divisors (see below), whose sum is σ = 90526241477952. Its totient is φ = 25820876220560.

The previous prime is 51685516642813. The next prime is 51685516642861. The reversal of 51685516642828 is 82824661558615.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5470519900 + ... + 5470529347.

It is an arithmetic number, because the mean of its divisors is an integer number (7543853456496).

Almost surely, 2^{51685516642828} is an apocalyptic number.

It is an amenable number.

51685516642828 is a deficient number, since it is larger than the sum of its proper divisors (38840724835124).

51685516642828 is a wasteful number, since it uses less digits than its factorization.

51685516642828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10941050432 (or 10941050430 counting only the distinct ones).

The product of its digits is 221184000, while the sum is 67.

The spelling of 51685516642828 in words is "fifty-one trillion, six hundred eighty-five billion, five hundred sixteen million, six hundred forty-two thousand, eight hundred twenty-eight".