6663688 has 16 divisors (see below), whose sum is σ = 12617280. Its totient is φ = 3299088.

The previous prime is 6663673. The next prime is 6663731. The reversal of 6663688 is 8863666.

It is a super-2 number, since 2×6663688² = 88809475522688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3220 + ... + 4867.

It is an arithmetic number, because the mean of its divisors is an integer number (788580).

Almost surely, 2^6663688 is an apocalyptic number.

It is an amenable number.

6663688 is a deficient number, since it is larger than the sum of its proper divisors (5953592).

6663688 is a wasteful number, since it uses less digits than its factorization.

6663688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8196 (or 8192 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 6663688 is about 2581.4120167071. The cubic root of 6663688 is about 188.1791712740.

The spelling of 6663688 in words is "six million, six hundred sixty-three thousand, six hundred eighty-eight".