165255209 has 8 divisors (see below), whose sum is σ = 193967808. Its totient is φ = 137818800.

The previous prime is 165255199. The next prime is 165255247. The reversal of 165255209 is 902552561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165255209 - 2⁴ = 165255193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165255509) 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, 318767 + ... + 319284.

It is an arithmetic number, because the mean of its divisors is an integer number (24245976).

Almost surely, 2^165255209 is an apocalyptic number.

It is an amenable number.

165255209 is a deficient number, since it is larger than the sum of its proper divisors (28712599).

165255209 is an equidigital number, since it uses as much as digits as its factorization.

165255209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638095.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 165255209 is about 12855.1627372041. The cubic root of 165255209 is about 548.7632917946.

The spelling of 165255209 in words is "one hundred sixty-five million, two hundred fifty-five thousand, two hundred nine".