686217712686 has 48 divisors (see below), whose sum is σ = 1508858163792. Its totient is φ = 207901555840.

The previous prime is 686217712637. The next prime is 686217712709.

686217712686 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3488536 + ... + 3679988.

It is an arithmetic number, because the mean of its divisors is an integer number (31434545079).

Almost surely, 2^686217712686 is an apocalyptic number.

686217712686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

686217712686 is an abundant number, since it is smaller than the sum of its proper divisors (822640451106).

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

686217712686 is a wasteful number, since it uses less digits than its factorization.

686217712686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196417 (or 196406 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 60.

The spelling of 686217712686 in words is "six hundred eighty-six billion, two hundred seventeen million, seven hundred twelve thousand, six hundred eighty-six".