51206475091968 has 156 divisors (see below), whose sum is σ = 169042011244288. Its totient is φ = 14630421381120.

The previous prime is 51206475091939. The next prime is 51206475091987. The reversal of 51206475091968 is 86919057460215.

51206475091968 is a `hidden beast` number, since 5 + 1 + 2 + 0 + 64 + 7 + 509 + 1 + 9 + 68 = 666.

It is a super-2 number, since 2×51206475091968² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98960848 + ... + 99476943.

Almost surely, 2^{51206475091968} is an apocalyptic number.

It is an amenable number.

51206475091968 is an abundant number, since it is smaller than the sum of its proper divisors (117835536152320).

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

51206475091968 is a wasteful number, since it uses less digits than its factorization.

51206475091968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198437828 (or 198437803 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 63.

The spelling of 51206475091968 in words is "fifty-one trillion, two hundred six billion, four hundred seventy-five million, ninety-one thousand, nine hundred sixty-eight".