6668668666 has 8 divisors (see below), whose sum is σ = 10912366944. Its totient is φ = 3031213020.

The previous prime is 6668668637. The next prime is 6668668673.

6668668666 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6668668666² = 88942283553780439112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6668668598 and 6668668607.

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, 151560630 + ... + 151560673.

It is an arithmetic number, because the mean of its divisors is an integer number (1364045868).

Almost surely, 2^6668668666 is an apocalyptic number.

6668668666 is a deficient number, since it is larger than the sum of its proper divisors (4243698278).

6668668666 is a wasteful number, since it uses less digits than its factorization.

6668668666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303121316.

The product of its digits is 107495424, while the sum is 64.

The square root of 6668668666 is about 81661.9168645948. The cubic root of 6668668666 is about 1882.2604342571.

The spelling of 6668668666 in words is "six billion, six hundred sixty-eight million, six hundred sixty-eight thousand, six hundred sixty-six".