18167992187 has 2 divisors, whose sum is σ = 18167992188. Its totient is φ = 18167992186.

The previous prime is 18167992163. The next prime is 18167992217. The reversal of 18167992187 is 78129976181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18167992187 - 2²⁰ = 18166943611 is a prime.

It is not a weakly prime, because it can be changed into another prime (18167992387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083996093 + 9083996094.

It is an arithmetic number, because the mean of its divisors is an integer number (9083996094).

Almost surely, 2^18167992187 is an apocalyptic number.

18167992187 is a deficient number, since it is larger than the sum of its proper divisors (1).

18167992187 is an equidigital number, since it uses as much as digits as its factorization.

18167992187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 59.

The spelling of 18167992187 in words is "eighteen billion, one hundred sixty-seven million, nine hundred ninety-two thousand, one hundred eighty-seven".