18195831808 has 88 divisors (see below), whose sum is σ = 45349467264. Its totient is φ = 7089254400.

The previous prime is 18195831803. The next prime is 18195831809. The reversal of 18195831808 is 80813859181.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195831803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36538 + ... + 194233.

Almost surely, 2^18195831808 is an apocalyptic number.

It is an amenable number.

18195831808 is an abundant number, since it is smaller than the sum of its proper divisors (27153635456).

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

18195831808 is a wasteful number, since it uses less digits than its factorization.

18195831808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230809 (or 230791 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 52.

The spelling of 18195831808 in words is "eighteen billion, one hundred ninety-five million, eight hundred thirty-one thousand, eight hundred eight".