668866668866 has 32 divisors (see below), whose sum is σ = 1105493818176. Its totient is φ = 300979800000.

The previous prime is 668866668829. The next prime is 668866668901.

668866668866 is nontrivially palindromic in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21984821 + ... + 22015223.

It is an arithmetic number, because the mean of its divisors is an integer number (34546681818).

Almost surely, 2^668866668866 is an apocalyptic number.

668866668866 is a deficient number, since it is larger than the sum of its proper divisors (436627149310).

668866668866 is a wasteful number, since it uses less digits than its factorization.

668866668866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40418.

The product of its digits is 6879707136, while the sum is 80.

The spelling of 668866668866 in words is "six hundred sixty-eight billion, eight hundred sixty-six million, six hundred sixty-eight thousand, eight hundred sixty-six".