165895 has 4 divisors (see below), whose sum is σ = 199080. Its totient is φ = 132712.

The previous prime is 165887. The next prime is 165901. The reversal of 165895 is 598561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 598561 = 113 ⋅5297.

It is a cyclic number.

It is not a de Polignac number, because 165895 - 2³ = 165887 is a prime.

165895 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 165895.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16585 + ... + 16594.

It is an arithmetic number, because the mean of its divisors is an integer number (49770).

2¹⁶⁵⁸⁹⁵ is an apocalyptic number.

165895 is a deficient number, since it is larger than the sum of its proper divisors (33185).

165895 is an equidigital number, since it uses as much as digits as its factorization.

165895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33184.

The product of its digits is 10800, while the sum is 34.

The square root of 165895 is about 407.3020991844. The cubic root of 165895 is about 54.9470564905.

The spelling of 165895 in words is "one hundred sixty-five thousand, eight hundred ninety-five".