51355306536868 has 12 divisors (see below), whose sum is σ = 89923407236572. Its totient is φ = 25662904469280.

The previous prime is 51355306536817. The next prime is 51355306536907. The reversal of 51355306536868 is 86863560355315.

It can be written as a sum of positive squares in 2 ways, for example, as 17448816043684 + 33906490493184 = 4177178^2 + 5822928^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3687191955 + ... + 3687205882.

Almost surely, 2^{51355306536868} is an apocalyptic number.

It is an amenable number.

51355306536868 is a deficient number, since it is larger than the sum of its proper divisors (38568100699704).

51355306536868 is a wasteful number, since it uses less digits than its factorization.

51355306536868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374399582 (or 7374399580 counting only the distinct ones).

The product of its (nonzero) digits is 233280000, while the sum is 64.

The spelling of 51355306536868 in words is "fifty-one trillion, three hundred fifty-five billion, three hundred six million, five hundred thirty-six thousand, eight hundred sixty-eight".