165659 has 4 divisors (see below), whose sum is σ = 178416. Its totient is φ = 152904.

The previous prime is 165653. The next prime is 165667. The reversal of 165659 is 956561.

165659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165659 - 2¹² = 161563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6359 + ... + 6384.

It is an arithmetic number, because the mean of its divisors is an integer number (44604).

2¹⁶⁵⁶⁵⁹ is an apocalyptic number.

165659 is a deficient number, since it is larger than the sum of its proper divisors (12757).

165659 is a wasteful number, since it uses less digits than its factorization.

165659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12756.

The product of its digits is 8100, while the sum is 32.

The square root of 165659 is about 407.0122848269. The cubic root of 165659 is about 54.9209884769.

The spelling of 165659 in words is "one hundred sixty-five thousand, six hundred fifty-nine".