6644 has 12 divisors (see below), whose sum is σ = 12768. Its totient is φ = 3000.

The previous prime is 6637. The next prime is 6653. The reversal of 6644 is 4466.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 6644.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32 + ... + 119.

It is an arithmetic number, because the mean of its divisors is an integer number (1064).

2⁶⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

6644 is a deficient number, since it is larger than the sum of its proper divisors (6124).

6644 is a wasteful number, since it uses less digits than its factorization.

6644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 164 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 6644 is about 81.5107354893. The cubic root of 6644 is about 18.7993662077.

The spelling of 6644 in words is "six thousand, six hundred forty-four".