686666666686 has 32 divisors (see below), whose sum is σ = 1382937067008. Its totient is φ = 246953046240.

The previous prime is 686666666641. The next prime is 686666666689.

686666666686 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×686666666686² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686666666689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171493170 + ... + 171497173.

It is an arithmetic number, because the mean of its divisors is an integer number (43216783344).

Almost surely, 2^686666666686 is an apocalyptic number.

686666666686 is an abundant number, since it is smaller than the sum of its proper divisors (696270400322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686666666686 is a wasteful number, since it uses less digits than its factorization.

686666666686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342990376.

The product of its digits is 3869835264, while the sum is 76.

The spelling of 686666666686 in words is "six hundred eighty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty-six".