18161791052 has 24 divisors (see below), whose sum is σ = 32153572080. Its totient is φ = 8975141120.

The previous prime is 18161791027. The next prime is 18161791069. The reversal of 18161791052 is 25019716181.

It is a happy 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, 979427 + ... + 997797.

It is an arithmetic number, because the mean of its divisors is an integer number (1339732170).

Almost surely, 2^18161791052 is an apocalyptic number.

It is an amenable number.

18161791052 is a deficient number, since it is larger than the sum of its proper divisors (13991781028).

18161791052 is a wasteful number, since it uses less digits than its factorization.

18161791052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21241 (or 21239 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 41.

The spelling of 18161791052 in words is "eighteen billion, one hundred sixty-one million, seven hundred ninety-one thousand, fifty-two".