165018 has 16 divisors (see below), whose sum is σ = 377280. Its totient is φ = 47136.

The previous prime is 165001. The next prime is 165037. The reversal of 165018 is 810561.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 164985 and 165003.

It is an unprimeable number.

165018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1923 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (23580).

2¹⁶⁵⁰¹⁸ is an apocalyptic number.

165018 is an abundant number, since it is smaller than the sum of its proper divisors (212262).

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

165018 is a wasteful number, since it uses less digits than its factorization.

165018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 165018 is about 406.2240760959. The cubic root of 165018 is about 54.8500599269.

Adding to 165018 its reverse (810561), we get a palindrome (975579).

The spelling of 165018 in words is "one hundred sixty-five thousand, eighteen".