6668668 has 12 divisors (see below), whose sum is σ = 11779992. Its totient is φ = 3302960.

The previous prime is 6668659. The next prime is 6668687. The reversal of 6668668 is 8668666.

It is a super-2 number, since 2×6668668² = 88942265788448, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

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, 7363 + ... + 8218.

It is an arithmetic number, because the mean of its divisors is an integer number (981666).

Almost surely, 2^6668668 is an apocalyptic number.

It is an amenable number.

6668668 is a deficient number, since it is larger than the sum of its proper divisors (5111324).

6668668 is a wasteful number, since it uses less digits than its factorization.

6668668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15692 (or 15690 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 6668668 is about 2582.3764249234. The cubic root of 6668668 is about 188.2260371597.

The spelling of 6668668 in words is "six million, six hundred sixty-eight thousand, six hundred sixty-eight".