56251561818 has 32 divisors (see below), whose sum is σ = 114453155520. Its totient is φ = 18425755520.

The previous prime is 56251561763. The next prime is 56251561837. The reversal of 56251561818 is 81816515265.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 954448 + ... + 1011668.

It is an arithmetic number, because the mean of its divisors is an integer number (3576661110).

Almost surely, 2^56251561818 is an apocalyptic number.

56251561818 is an abundant number, since it is smaller than the sum of its proper divisors (58201593702).

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

56251561818 is a wasteful number, since it uses less digits than its factorization.

56251561818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60062.

The product of its digits is 576000, while the sum is 48.

The spelling of 56251561818 in words is "fifty-six billion, two hundred fifty-one million, five hundred sixty-one thousand, eight hundred eighteen".