6663856 has 10 divisors (see below), whose sum is σ = 12911252. Its totient is φ = 3331920.

The previous prime is 6663841. The next prime is 6663857. The reversal of 6663856 is 6583666.

It is not an unprimeable number, because it can be changed into a prime (6663857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208230 + ... + 208261.

Almost surely, 2^6663856 is an apocalyptic number.

It is an amenable number.

6663856 is a deficient number, since it is larger than the sum of its proper divisors (6247396).

6663856 is a wasteful number, since it uses less digits than its factorization.

6663856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416499 (or 416493 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 6663856 is about 2581.4445568325. Note that the first 3 decimals coincide. The cubic root of 6663856 is about 188.1807526723.

The spelling of 6663856 in words is "six million, six hundred sixty-three thousand, eight hundred fifty-six".