51656664311 has 12 divisors (see below), whose sum is σ = 60117587640. Its totient is φ = 44257111920.

The previous prime is 51656664299. The next prime is 51656664329. The reversal of 51656664311 is 11346665615.

It is not a de Polignac number, because 51656664311 - 2⁶ = 51656664247 is a prime.

It is a super-2 number, since 2×51656664311² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656664511) 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 11 ways as a sum of consecutive naturals, for example, 128501 + ... + 346158.

It is an arithmetic number, because the mean of its divisors is an integer number (5009798970).

Almost surely, 2^51656664311 is an apocalyptic number.

51656664311 is a deficient number, since it is larger than the sum of its proper divisors (8460923329).

51656664311 is a wasteful number, since it uses less digits than its factorization.

51656664311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476894 (or 476887 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The spelling of 51656664311 in words is "fifty-one billion, six hundred fifty-six million, six hundred sixty-four thousand, three hundred eleven".