686663366686 has 16 divisors (see below), whose sum is σ = 1182769436160. Its totient is φ = 295692358680.

The previous prime is 686663366681. The next prime is 686663366689.

686663366686 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686663366681) 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, 821367246 + ... + 821368081.

It is an arithmetic number, because the mean of its divisors is an integer number (73923089760).

Almost surely, 2^686663366686 is an apocalyptic number.

686663366686 is a deficient number, since it is larger than the sum of its proper divisors (496106069474).

686663366686 is a wasteful number, since it uses less digits than its factorization.

686663366686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642735359.

The product of its digits is 967458816, while the sum is 70.

The spelling of 686663366686 in words is "six hundred eighty-six billion, six hundred sixty-three million, three hundred sixty-six thousand, six hundred eighty-six".