51368268218555 has 16 divisors (see below), whose sum is σ = 61653114511104. Its totient is φ = 41087153577600.

The previous prime is 51368268218551. The next prime is 51368268218557. The reversal of 51368268218555 is 55581286286315.

It is a happy number.

It is not a de Polignac number, because 51368268218555 - 2² = 51368268218551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51368268218491 and 51368268218500.

It is not an unprimeable number, because it can be changed into a prime (51368268218551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711209174 + ... + 711281396.

It is an arithmetic number, because the mean of its divisors is an integer number (3853319656944).

Almost surely, 2^{51368268218555} is an apocalyptic number.

51368268218555 is a deficient number, since it is larger than the sum of its proper divisors (10284846292549).

51368268218555 is a wasteful number, since it uses less digits than its factorization.

51368268218555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96086.

The product of its digits is 138240000, while the sum is 65.

The spelling of 51368268218555 in words is "fifty-one trillion, three hundred sixty-eight billion, two hundred sixty-eight million, two hundred eighteen thousand, five hundred fifty-five".