18189380308 has 12 divisors (see below), whose sum is σ = 34725180672. Its totient is φ = 8267900120.

The previous prime is 18189380239. The next prime is 18189380311. The reversal of 18189380308 is 80308398181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206697460 + ... + 206697547.

It is an arithmetic number, because the mean of its divisors is an integer number (2893765056).

Almost surely, 2^18189380308 is an apocalyptic number.

It is an amenable number.

18189380308 is a deficient number, since it is larger than the sum of its proper divisors (16535800364).

18189380308 is a wasteful number, since it uses less digits than its factorization.

18189380308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413395022 (or 413395020 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 18189380308 in words is "eighteen billion, one hundred eighty-nine million, three hundred eighty thousand, three hundred eight".