165386817 has 6 divisors (see below), whose sum is σ = 238892082. Its totient is φ = 110257872.

The previous prime is 165386807. The next prime is 165386839. The reversal of 165386817 is 718683561.

165386817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 161188416 + 4198401 = 12696^2 + 2049^2 .

It is not a de Polignac number, because 165386817 - 2¹⁰ = 165385793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165386807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9188148 + ... + 9188165.

It is an arithmetic number, because the mean of its divisors is an integer number (39815347).

Almost surely, 2^165386817 is an apocalyptic number.

It is an amenable number.

165386817 is a deficient number, since it is larger than the sum of its proper divisors (73505265).

165386817 is a wasteful number, since it uses less digits than its factorization.

165386817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18376319 (or 18376316 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 165386817 is about 12860.2805956946. The cubic root of 165386817 is about 548.9089301197.

The spelling of 165386817 in words is "one hundred sixty-five million, three hundred eighty-six thousand, eight hundred seventeen".