165995 has 4 divisors (see below), whose sum is σ = 199200. Its totient is φ = 132792.

The previous prime is 165983. The next prime is 166013. The reversal of 165995 is 599561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165995 - 2⁶ = 165931 is a prime.

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, 16595 + ... + 16604.

It is an arithmetic number, because the mean of its divisors is an integer number (49800).

2¹⁶⁵⁹⁹⁵ is an apocalyptic number.

165995 is a deficient number, since it is larger than the sum of its proper divisors (33205).

165995 is an equidigital number, since it uses as much as digits as its factorization.

165995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33204.

The product of its digits is 12150, while the sum is 35.

The square root of 165995 is about 407.4248396944. The cubic root of 165995 is about 54.9580948018.

The spelling of 165995 in words is "one hundred sixty-five thousand, nine hundred ninety-five".