6668 has 6 divisors (see below), whose sum is σ = 11676. Its totient is φ = 3332.

The previous prime is 6661. The next prime is 6673. The reversal of 6668 is 8666.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830 + ... + 837.

It is an arithmetic number, because the mean of its divisors is an integer number (1946).

2⁶⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

6668 is a deficient number, since it is larger than the sum of its proper divisors (5008).

6668 is a wasteful number, since it uses less digits than its factorization.

6668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1669 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 6668 is about 81.6578226504. The cubic root of 6668 is about 18.8219752087.

The spelling of 6668 in words is "six thousand, six hundred sixty-eight".