18520259855268 has 24 divisors (see below), whose sum is σ = 43215017822368. Its totient is φ = 6173265928896.

The previous prime is 18520259855261. The next prime is 18520259855299. The reversal of 18520259855268 is 86255895202581.

It is a junction number, because it is equal to n+sod(n) for n = 18520259855199 and 18520259855208.

It is not an unprimeable number, because it can be changed into a prime (18520259855261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18751321 + ... + 19714272.

Almost surely, 2^{18520259855268} is an apocalyptic number.

It is an amenable number.

18520259855268 is an abundant number, since it is smaller than the sum of its proper divisors (24694757967100).

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

18520259855268 is a wasteful number, since it uses less digits than its factorization.

18520259855268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38505723 (or 38505721 counting only the distinct ones).

The product of its (nonzero) digits is 138240000, while the sum is 66.

The spelling of 18520259855268 in words is "eighteen trillion, five hundred twenty billion, two hundred fifty-nine million, eight hundred fifty-five thousand, two hundred sixty-eight".