18378335833 has 24 divisors (see below), whose sum is σ = 22456732928. Its totient is φ = 14924844000.

The previous prime is 18378335797. The next prime is 18378335873. The reversal of 18378335833 is 33853387381.

It is a de Polignac number, because none of the positive numbers 2^k-18378335833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18378335873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139683 + ... + 237208.

Almost surely, 2^18378335833 is an apocalyptic number.

18378335833 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18378335833 is a deficient number, since it is larger than the sum of its proper divisors (4078397095).

18378335833 is a wasteful number, since it uses less digits than its factorization.

18378335833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376957 (or 376946 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 18378335833 in words is "eighteen billion, three hundred seventy-eight million, three hundred thirty-five thousand, eight hundred thirty-three".