51864131508 has 96 divisors (see below), whose sum is σ = 149518387200. Its totient is φ = 13658979456.

The previous prime is 51864131467. The next prime is 51864131509. The reversal of 51864131508 is 80513146815.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 51864131508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51864131509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380088 + ... + 498191.

It is an arithmetic number, because the mean of its divisors is an integer number (1557483200).

Almost surely, 2^51864131508 is an apocalyptic number.

It is an amenable number.

51864131508 is an abundant number, since it is smaller than the sum of its proper divisors (97654255692).

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

51864131508 is a wasteful number, since it uses less digits than its factorization.

51864131508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878349 (or 878347 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 51864131508 in words is "fifty-one billion, eight hundred sixty-four million, one hundred thirty-one thousand, five hundred eight".