165506 has 8 divisors (see below), whose sum is σ = 270864. Its totient is φ = 75220.

The previous prime is 165479. The next prime is 165511. The reversal of 165506 is 605561.

165506 is nontrivially palindromic in base 16.

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

It is a Curzon number.

It is a plaindrome in base 14.

It is an unprimeable number.

165506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3740 + ... + 3783.

It is an arithmetic number, because the mean of its divisors is an integer number (33858).

2¹⁶⁵⁵⁰⁶ is an apocalyptic number.

165506 is a deficient number, since it is larger than the sum of its proper divisors (105358).

165506 is a wasteful number, since it uses less digits than its factorization.

165506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7536.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 165506 is about 406.8242863940. The cubic root of 165506 is about 54.9040752204.

The spelling of 165506 in words is "one hundred sixty-five thousand, five hundred six".