6643916 has 12 divisors (see below), whose sum is σ = 11645088. Its totient is φ = 3316752.

The previous prime is 6643909. The next prime is 6643919. The reversal of 6643916 is 6193466.

It is not an unprimeable number, because it can be changed into a prime (6643919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3725 + ... + 5211.

It is an arithmetic number, because the mean of its divisors is an integer number (970424).

Almost surely, 2^6643916 is an apocalyptic number.

It is an amenable number.

6643916 is a deficient number, since it is larger than the sum of its proper divisors (5001172).

6643916 is a wasteful number, since it uses less digits than its factorization.

6643916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2606 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 6643916 is about 2577.5794847104. The cubic root of 6643916 is about 187.9928698065.

The spelling of 6643916 in words is "six million, six hundred forty-three thousand, nine hundred sixteen".