6668666668666 has 16 divisors (see below), whose sum is σ = 10082775745440. Its totient is φ = 3307829913360.

The previous prime is 6668666668637. The next prime is 6668666668681.

6668666668666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6668666668666² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6668666668666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21972276 + ... + 22273711.

It is an arithmetic number, because the mean of its divisors is an integer number (630173484090).

Almost surely, 2^{6668666668666} is an apocalyptic number.

6668666668666 is a deficient number, since it is larger than the sum of its proper divisors (3414109076774).

6668666668666 is a wasteful number, since it uses less digits than its factorization.

6668666668666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44246589.

The product of its digits is 23219011584, while the sum is 82.

The spelling of 6668666668666 in words is "six trillion, six hundred sixty-eight billion, six hundred sixty-six million, six hundred sixty-eight thousand, six hundred sixty-six".