165918199 has 2 divisors, whose sum is σ = 165918200. Its totient is φ = 165918198.

The previous prime is 165918173. The next prime is 165918211. The reversal of 165918199 is 991819561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165918199 - 2⁵ = 165918167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165918299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82959099 + 82959100.

It is an arithmetic number, because the mean of its divisors is an integer number (82959100).

Almost surely, 2^165918199 is an apocalyptic number.

165918199 is a deficient number, since it is larger than the sum of its proper divisors (1).

165918199 is an equidigital number, since it uses as much as digits as its factorization.

165918199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 49.

The square root of 165918199 is about 12880.9238410915. The cubic root of 165918199 is about 549.4961766338.

The spelling of 165918199 in words is "one hundred sixty-five million, nine hundred eighteen thousand, one hundred ninety-nine".