16855 has 4 divisors (see below), whose sum is σ = 20232. Its totient is φ = 13480.

The previous prime is 16843. The next prime is 16871. The reversal of 16855 is 55861.

16855 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 55861 = 13 ⋅4297.

It is not a de Polignac number, because 16855 - 2⁵ = 16823 is a prime.

It is a Duffinian number.

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, 1681 + ... + 1690.

It is an arithmetic number, because the mean of its divisors is an integer number (5058).

2¹⁶⁸⁵⁵ is an apocalyptic number.

16855 is a deficient number, since it is larger than the sum of its proper divisors (3377).

16855 is an equidigital number, since it uses as much as digits as its factorization.

16855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376.

The product of its digits is 1200, while the sum is 25.

The square root of 16855 is about 129.8268077093. The cubic root of 16855 is about 25.6395020035.

The spelling of 16855 in words is "sixteen thousand, eight hundred fifty-five".