165570 has 16 divisors (see below), whose sum is σ = 397440. Its totient is φ = 44144.

The previous prime is 165569. The next prime is 165587. The reversal of 165570 is 75561.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165570.

It is a congruent number.

It is an unprimeable 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, 2730 + ... + 2789.

It is an arithmetic number, because the mean of its divisors is an integer number (24840).

2¹⁶⁵⁵⁷⁰ is an apocalyptic number.

165570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165570 is an abundant number, since it is smaller than the sum of its proper divisors (231870).

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

165570 is a wasteful number, since it uses less digits than its factorization.

165570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5529.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 165570 is about 406.9029368289. The cubic root of 165570 is about 54.9111513142.

Subtracting from 165570 its reverse (75561), we obtain a palindrome (90009).

The spelling of 165570 in words is "one hundred sixty-five thousand, five hundred seventy".