51857627856 has 80 divisors (see below), whose sum is σ = 144610565760. Its totient is φ = 15964157440.

The previous prime is 51857627837. The next prime is 51857627909. The reversal of 51857627856 is 65872675815.

It is a self number, because there is not a number n which added to its sum of digits gives 51857627856.

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, 777855 + ... + 841886.

It is an arithmetic number, because the mean of its divisors is an integer number (1807632072).

Almost surely, 2^51857627856 is an apocalyptic number.

It is an amenable number.

51857627856 is an abundant number, since it is smaller than the sum of its proper divisors (92752937904).

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

51857627856 is a wasteful number, since it uses less digits than its factorization.

51857627856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619804 (or 1619798 counting only the distinct ones).

The product of its digits is 28224000, while the sum is 60.

The spelling of 51857627856 in words is "fifty-one billion, eight hundred fifty-seven million, six hundred twenty-seven thousand, eight hundred fifty-six".