51138764832 has 24 divisors (see below), whose sum is σ = 134239257936. Its totient is φ = 17046254912.

The previous prime is 51138764821. The next prime is 51138764891. The reversal of 51138764832 is 23846783115.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 266347638 + ... + 266347829.

It is an arithmetic number, because the mean of its divisors is an integer number (5593302414).

Almost surely, 2^51138764832 is an apocalyptic number.

It is an amenable number.

51138764832 is an abundant number, since it is smaller than the sum of its proper divisors (83100493104).

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

51138764832 is a wasteful number, since it uses less digits than its factorization.

51138764832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532695480 (or 532695472 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The spelling of 51138764832 in words is "fifty-one billion, one hundred thirty-eight million, seven hundred sixty-four thousand, eight hundred thirty-two".