165817169 has 16 divisors (see below), whose sum is σ = 191889408. Its totient is φ = 140352912.

The previous prime is 165817153. The next prime is 165817181. The reversal of 165817169 is 961718561.

It is not a de Polignac number, because 165817169 - 2⁴ = 165817153 is a prime.

It is a super-2 number, since 2×165817169² = 54990667070349122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165811169) 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 15 ways as a sum of consecutive naturals, for example, 340244 + ... + 340730.

It is an arithmetic number, because the mean of its divisors is an integer number (11993088).

Almost surely, 2^165817169 is an apocalyptic number.

It is an amenable number.

165817169 is a deficient number, since it is larger than the sum of its proper divisors (26072239).

165817169 is a wasteful number, since it uses less digits than its factorization.

165817169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004.

The product of its digits is 90720, while the sum is 44.

The square root of 165817169 is about 12877.0015531567. The cubic root of 165817169 is about 549.3846219220.

It can be divided in two parts, 16 and 5817169, that added together give a palindrome (5817185).

The spelling of 165817169 in words is "one hundred sixty-five million, eight hundred seventeen thousand, one hundred sixty-nine".