18191129908 has 24 divisors (see below), whose sum is σ = 36441070400. Its totient is φ = 7783596288.

The previous prime is 18191129851. The next prime is 18191129911. The reversal of 18191129908 is 80992119181.

It is a happy number.

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, 507453 + ... + 542116.

Almost surely, 2^18191129908 is an apocalyptic number.

It is an amenable number.

18191129908 is an abundant number, since it is smaller than the sum of its proper divisors (18249940492).

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

18191129908 is a wasteful number, since it uses less digits than its factorization.

18191129908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050199 (or 1050197 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 49.

The spelling of 18191129908 in words is "eighteen billion, one hundred ninety-one million, one hundred twenty-nine thousand, nine hundred eight".