165338816322217 has 4 divisors (see below), whose sum is σ = 165722433065856. Its totient is φ = 164955199578580.

The previous prime is 165338816322203. The next prime is 165338816322223. The reversal of 165338816322217 is 712223618833561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165338816322217 - 2⁷ = 165338816322089 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165338816322817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191808371173 + ... + 191808372034.

It is an arithmetic number, because the mean of its divisors is an integer number (41430608266464).

Almost surely, 2^{165338816322217} is an apocalyptic number.

It is an amenable number.

165338816322217 is a deficient number, since it is larger than the sum of its proper divisors (383616743639).

165338816322217 is an equidigital number, since it uses as much as digits as its factorization.

165338816322217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383616743638.

The product of its digits is 17418240, while the sum is 58.

The spelling of 165338816322217 in words is "one hundred sixty-five trillion, three hundred thirty-eight billion, eight hundred sixteen million, three hundred twenty-two thousand, two hundred seventeen".