16685 has 8 divisors (see below), whose sum is σ = 20736. Its totient is φ = 12880.

The previous prime is 16673. The next prime is 16691. The reversal of 16685 is 58661.

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

It is not a de Polignac number, because 16685 - 2¹⁰ = 15661 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200 + ... + 270.

It is an arithmetic number, because the mean of its divisors is an integer number (2592).

2¹⁶⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

16685 is a deficient number, since it is larger than the sum of its proper divisors (4051).

16685 is an equidigital number, since it uses as much as digits as its factorization.

16685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123.

The product of its digits is 1440, while the sum is 26.

The square root of 16685 is about 129.1704300527. The cubic root of 16685 is about 25.5530103185.

The spelling of 16685 in words is "sixteen thousand, six hundred eighty-five".