51365100012564 has 48 divisors (see below), whose sum is σ = 129082521661632. Its totient is φ = 15803269254912.

The previous prime is 51365100012547. The next prime is 51365100012623. The reversal of 51365100012564 is 46521000156315.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12545649 + ... + 16128344.

It is an arithmetic number, because the mean of its divisors is an integer number (2689219201284).

Almost surely, 2^{51365100012564} is an apocalyptic number.

It is an amenable number.

51365100012564 is an abundant number, since it is smaller than the sum of its proper divisors (77717421649068).

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

51365100012564 is a wasteful number, since it uses less digits than its factorization.

51365100012564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28685496 (or 28685494 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

Adding to 51365100012564 its reverse (46521000156315), we get a palindrome (97886100168879).

The spelling of 51365100012564 in words is "fifty-one trillion, three hundred sixty-five billion, one hundred million, twelve thousand, five hundred sixty-four".