It is a sphenic number, since it is the product of 3 distinct primes.
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.
216685 is an apocalyptic number.
It is an amenable number.
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 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".