51564313775 has 24 divisors (see below), whose sum is σ = 69017405520. Its totient is φ = 37990218240.

The previous prime is 51564313751. The next prime is 51564313777. The reversal of 51564313775 is 57731346515.

It is not a de Polignac number, because 51564313775 - 2¹⁸ = 51564051631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51564313777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42485 + ... + 323934.

It is an arithmetic number, because the mean of its divisors is an integer number (2875725230).

Almost surely, 2^51564313775 is an apocalyptic number.

51564313775 is a deficient number, since it is larger than the sum of its proper divisors (17453091745).

51564313775 is a wasteful number, since it uses less digits than its factorization.

51564313775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366875 (or 366870 counting only the distinct ones).

The product of its digits is 1323000, while the sum is 47.

The spelling of 51564313775 in words is "fifty-one billion, five hundred sixty-four million, three hundred thirteen thousand, seven hundred seventy-five".