165685 has 8 divisors (see below), whose sum is σ = 214200. Its totient is φ = 122304.

The previous prime is 165673. The next prime is 165701. The reversal of 165685 is 586561.

165685 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 4 ways, for example, as 22801 + 142884 = 151^2 + 378^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165685 - 2⁵ = 165653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1210 + ... + 1339.

It is an arithmetic number, because the mean of its divisors is an integer number (26775).

2¹⁶⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

165685 is a deficient number, since it is larger than the sum of its proper divisors (48515).

165685 is a wasteful number, since it uses less digits than its factorization.

165685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567.

The product of its digits is 7200, while the sum is 31.

The square root of 165685 is about 407.0442236416. The cubic root of 165685 is about 54.9238615897.

The spelling of 165685 in words is "one hundred sixty-five thousand, six hundred eighty-five".