165322809 has 8 divisors (see below), whose sum is σ = 244922720. Its totient is φ = 110215188.

The previous prime is 165322799. The next prime is 165322837. The reversal of 165322809 is 908223561.

It is not a de Polignac number, because 165322809 - 2⁴ = 165322793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165322849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3061507 + ... + 3061560.

It is an arithmetic number, because the mean of its divisors is an integer number (30615340).

Almost surely, 2^165322809 is an apocalyptic number.

It is an amenable number.

165322809 is a deficient number, since it is larger than the sum of its proper divisors (79599911).

165322809 is an equidigital number, since it uses as much as digits as its factorization.

165322809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6123076 (or 6123070 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 165322809 is about 12857.7917621962. The cubic root of 165322809 is about 548.8381080775.

The spelling of 165322809 in words is "one hundred sixty-five million, three hundred twenty-two thousand, eight hundred nine".