6543664 has 10 divisors (see below), whose sum is σ = 12678380. Its totient is φ = 3271824.

The previous prime is 6543659. The next prime is 6543671. The reversal of 6543664 is 4663456.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204474 + ... + 204505.

It is an arithmetic number, because the mean of its divisors is an integer number (1267838).

Almost surely, 2^6543664 is an apocalyptic number.

It is an amenable number.

6543664 is a deficient number, since it is larger than the sum of its proper divisors (6134716).

6543664 is a wasteful number, since it uses less digits than its factorization.

6543664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408987 (or 408981 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 6543664 is about 2558.0586388900. The cubic root of 6543664 is about 187.0425137118.

The spelling of 6543664 in words is "six million, five hundred forty-three thousand, six hundred sixty-four".