6686682866866 has 16 divisors (see below), whose sum is σ = 10049732731584. Its totient is φ = 3336774195184.

The previous prime is 6686682866839. The next prime is 6686682866887.

6686682866866 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6686682866866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5448195 + ... + 6561721.

It is an arithmetic number, because the mean of its divisors is an integer number (628108295724).

Almost surely, 2^{6686682866866} is an apocalyptic number.

6686682866866 is a deficient number, since it is larger than the sum of its proper divisors (3363049864718).

6686682866866 is a wasteful number, since it uses less digits than its factorization.

6686682866866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119425.

The product of its digits is 13759414272, while the sum is 82.

The spelling of 6686682866866 in words is "six trillion, six hundred eighty-six billion, six hundred eighty-two million, eight hundred sixty-six thousand, eight hundred sixty-six".