6663644 has 12 divisors (see below), whose sum is σ = 12558504. Its totient is φ = 3075504.

The previous prime is 6663617. The next prime is 6663647. The reversal of 6663644 is 4463666.

6663644 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663647) 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, 64022 + ... + 64125.

It is an arithmetic number, because the mean of its divisors is an integer number (1046542).

Almost surely, 2^6663644 is an apocalyptic number.

It is an amenable number.

6663644 is a deficient number, since it is larger than the sum of its proper divisors (5894860).

6663644 is a wasteful number, since it uses less digits than its factorization.

6663644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128164 (or 128162 counting only the distinct ones).

The product of its digits is 62208, while the sum is 35.

The square root of 6663644 is about 2581.4034942256. The cubic root of 6663644 is about 188.1787570939.

The spelling of 6663644 in words is "six million, six hundred sixty-three thousand, six hundred forty-four".