51387538848 has 24 divisors (see below), whose sum is σ = 134892289728. Its totient is φ = 17129179584.

The previous prime is 51387538831. The next prime is 51387538861. The reversal of 51387538848 is 84883578315.

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

It is a junction number, because it is equal to n+sod(n) for n = 51387538791 and 51387538800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267643336 + ... + 267643527.

It is an arithmetic number, because the mean of its divisors is an integer number (5620512072).

Almost surely, 2^51387538848 is an apocalyptic number.

It is an amenable number.

51387538848 is an abundant number, since it is smaller than the sum of its proper divisors (83504750880).

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

51387538848 is a wasteful number, since it uses less digits than its factorization.

51387538848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535286876 (or 535286868 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 60.

The spelling of 51387538848 in words is "fifty-one billion, three hundred eighty-seven million, five hundred thirty-eight thousand, eight hundred forty-eight".