18381135256 has 32 divisors (see below), whose sum is σ = 37616834880. Its totient is φ = 8350826400.

The previous prime is 18381135247. The next prime is 18381135271. The reversal of 18381135256 is 65253118381.

It is a happy number.

It is a super-2 number, since 2×18381135256² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125035 + ... + 228901.

It is an arithmetic number, because the mean of its divisors is an integer number (1175526090).

Almost surely, 2^18381135256 is an apocalyptic number.

It is an amenable number.

18381135256 is an abundant number, since it is smaller than the sum of its proper divisors (19235699624).

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

18381135256 is a wasteful number, since it uses less digits than its factorization.

18381135256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105895 (or 105891 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The spelling of 18381135256 in words is "eighteen billion, three hundred eighty-one million, one hundred thirty-five thousand, two hundred fifty-six".