18219840167 has 2 divisors, whose sum is σ = 18219840168. Its totient is φ = 18219840166.

The previous prime is 18219840161. The next prime is 18219840229. The reversal of 18219840167 is 76104891281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18219840167 - 2²² = 18215645863 is a prime.

It is a super-2 number, since 2×18219840167² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18219840161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109920083 + 9109920084.

It is an arithmetic number, because the mean of its divisors is an integer number (9109920084).

Almost surely, 2^18219840167 is an apocalyptic number.

18219840167 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219840167 is an equidigital number, since it uses as much as digits as its factorization.

18219840167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 18219840167 in words is "eighteen billion, two hundred nineteen million, eight hundred forty thousand, one hundred sixty-seven".