165855 has 8 divisors (see below), whose sum is σ = 265392. Its totient is φ = 88448.

The previous prime is 165833. The next prime is 165857. The reversal of 165855 is 558561.

It is a happy number.

165855 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 165855 - 2⁹ = 165343 is a prime.

It is an Ulam number.

165855 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5514 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (33174).

2¹⁶⁵⁸⁵⁵ is an apocalyptic number.

165855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165855 is a deficient number, since it is larger than the sum of its proper divisors (99537).

165855 is a wasteful number, since it uses less digits than its factorization.

165855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11065.

The product of its digits is 6000, while the sum is 30.

The square root of 165855 is about 407.2529926225. The cubic root of 165855 is about 54.9426399239.

It can be divided in two parts, 1 and 65855, that added together give a palindrome (65856).

The spelling of 165855 in words is "one hundred sixty-five thousand, eight hundred fifty-five".