18385533356 has 24 divisors (see below), whose sum is σ = 32394828480. Its totient is φ = 9129923712.

The previous prime is 18385533347. The next prime is 18385533379. The reversal of 18385533356 is 65333558381.

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, 1647965 + ... + 1659083.

It is an arithmetic number, because the mean of its divisors is an integer number (1349784520).

Almost surely, 2^18385533356 is an apocalyptic number.

It is an amenable number.

18385533356 is a deficient number, since it is larger than the sum of its proper divisors (14009295124).

18385533356 is a wasteful number, since it uses less digits than its factorization.

18385533356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13913 (or 13911 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 50.

The spelling of 18385533356 in words is "eighteen billion, three hundred eighty-five million, five hundred thirty-three thousand, three hundred fifty-six".