51387818384 has 40 divisors (see below), whose sum is σ = 116562622848. Its totient is φ = 21486193920.

The previous prime is 51387818353. The next prime is 51387818389. The reversal of 51387818384 is 48381878315.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (51387818389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5590772 + ... + 5599955.

Almost surely, 2^51387818384 is an apocalyptic number.

It is an amenable number.

51387818384 is an abundant number, since it is smaller than the sum of its proper divisors (65174804464).

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

51387818384 is a wasteful number, since it uses less digits than its factorization.

51387818384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11190783 (or 11190777 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 56.

The spelling of 51387818384 in words is "fifty-one billion, three hundred eighty-seven million, eight hundred eighteen thousand, three hundred eighty-four".