165318 has 16 divisors (see below), whose sum is σ = 336960. Its totient is φ = 54056.

The previous prime is 165317. The next prime is 165331. The reversal of 165318 is 813561.

It is a super-2 number, since 2×165318² = 54660082248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121 + ... + 587.

It is an arithmetic number, because the mean of its divisors is an integer number (21060).

2¹⁶⁵³¹⁸ is an apocalyptic number.

165318 is an abundant number, since it is smaller than the sum of its proper divisors (171642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165318 is a wasteful number, since it uses less digits than its factorization.

165318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531.

The product of its digits is 720, while the sum is 24.

The square root of 165318 is about 406.5931627561. The cubic root of 165318 is about 54.8832786392.

Adding to 165318 its reverse (813561), we get a palindrome (978879).

The spelling of 165318 in words is "one hundred sixty-five thousand, three hundred eighteen".