6685 has 8 divisors (see below), whose sum is σ = 9216.
Its totient is φ = 4560.
The previous prime is 6679. The next prime is 6689. The reversal of 6685 is 5866.
6685 = T14 + T15 + ... +
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 6685 - 25 = 6653 is a prime.
It is a magnanimous number.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6689) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61 + ... + 130.
It is an arithmetic number, because the mean of its divisors is an integer number (1152).
26685 is an apocalyptic number.
It is an amenable number.
6685 is a deficient number, since it is larger than the sum of its proper divisors (2531).
6685 is a wasteful number, since it uses less digits than its factorization.
6685 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 203.
The product of its digits is 1440, while the sum is 25.
The square root of 6685 is about 81.7618492942.
The cubic root of 6685 is about 18.8379571143.
It can be divided in two parts, 66 and 85, that added together give a palindrome (151).
The spelling of 6685 in words is "six thousand, six hundred eighty-five".