51257328168 has 64 divisors (see below), whose sum is σ = 129000983040. Its totient is φ = 16971539904.

The previous prime is 51257328163. The next prime is 51257328191. The reversal of 51257328168 is 86182375215.

51257328168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51257328163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12997605 + ... + 13001547.

It is an arithmetic number, because the mean of its divisors is an integer number (2015640360).

Almost surely, 2^51257328168 is an apocalyptic number.

It is an amenable number.

51257328168 is an abundant number, since it is smaller than the sum of its proper divisors (77743654872).

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

51257328168 is a wasteful number, since it uses less digits than its factorization.

51257328168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438 (or 7434 counting only the distinct ones).

The product of its digits is 806400, while the sum is 48.

The spelling of 51257328168 in words is "fifty-one billion, two hundred fifty-seven million, three hundred twenty-eight thousand, one hundred sixty-eight".