51164536365 has 48 divisors (see below), whose sum is σ = 96364270080. Its totient is φ = 25017621120.

The previous prime is 51164536309. The next prime is 51164536369. The reversal of 51164536365 is 56363546115.

It is a happy number.

51164536365 is a `hidden beast` number, since 5 + 1 + 1 + 6 + 4 + 5 + 3 + 636 + 5 = 666.

It is not a de Polignac number, because 51164536365 - 2⁸ = 51164536109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51164536365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51164536369) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 938682 + ... + 991691.

It is an arithmetic number, because the mean of its divisors is an integer number (2007588960).

Almost surely, 2^51164536365 is an apocalyptic number.

It is an amenable number.

51164536365 is a deficient number, since it is larger than the sum of its proper divisors (45199733715).

51164536365 is a wasteful number, since it uses less digits than its factorization.

51164536365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930434 (or 1930431 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The spelling of 51164536365 in words is "fifty-one billion, one hundred sixty-four million, five hundred thirty-six thousand, three hundred sixty-five".