165255217 has 8 divisors (see below), whose sum is σ = 175064000. Its totient is φ = 155557584.

The previous prime is 165255199. The next prime is 165255247. The reversal of 165255217 is 712552561.

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

It is a cyclic number.

It is not a de Polignac number, because 165255217 - 2¹¹ = 165253169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165255247) 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, 24717 + ... + 30682.

It is an arithmetic number, because the mean of its divisors is an integer number (21883000).

Almost surely, 2^165255217 is an apocalyptic number.

It is an amenable number.

165255217 is a deficient number, since it is larger than the sum of its proper divisors (9808783).

165255217 is a wasteful number, since it uses less digits than its factorization.

165255217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55575.

The product of its digits is 21000, while the sum is 34.

The square root of 165255217 is about 12855.1630483631. The cubic root of 165255217 is about 548.7633006498.

The spelling of 165255217 in words is "one hundred sixty-five million, two hundred fifty-five thousand, two hundred seventeen".