6668668868 has 24 divisors (see below), whose sum is σ = 12287167200. Its totient is φ = 3158129088.

The previous prime is 6668668861. The next prime is 6668668879. The reversal of 6668668868 is 8688668666.

It is a super-2 number, since 2×6668668868² = 88942288942064802848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6668668798 and 6668668807.

It is not an unprimeable number, because it can be changed into a prime (6668668861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499496 + ... + 512672.

It is an arithmetic number, because the mean of its divisors is an integer number (511965300).

Almost surely, 2^6668668868 is an apocalyptic number.

It is an amenable number.

6668668868 is a deficient number, since it is larger than the sum of its proper divisors (5618498332).

6668668868 is a wasteful number, since it uses less digits than its factorization.

6668668868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19859 (or 19857 counting only the distinct ones).

The product of its digits is 191102976, while the sum is 68.

The square root of 6668668868 is about 81661.9181014015. The cubic root of 6668668868 is about 1882.2604532622.

The spelling of 6668668868 in words is "six billion, six hundred sixty-eight million, six hundred sixty-eight thousand, eight hundred sixty-eight".