165365199 has 16 divisors (see below), whose sum is σ = 245363040. Its totient is φ = 110073600.

The previous prime is 165365111. The next prime is 165365201. The reversal of 165365199 is 991563561.

It is not a de Polignac number, because 165365199 - 2¹⁹ = 164840911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165565199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14559 + ... + 23295.

It is an arithmetic number, because the mean of its divisors is an integer number (15335190).

Almost surely, 2^165365199 is an apocalyptic number.

165365199 is a deficient number, since it is larger than the sum of its proper divisors (79997841).

165365199 is an equidigital number, since it uses as much as digits as its factorization.

165365199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447 (or 9441 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 165365199 is about 12859.4400733469. The cubic root of 165365199 is about 548.8850127956.

The spelling of 165365199 in words is "one hundred sixty-five million, three hundred sixty-five thousand, one hundred ninety-nine".