686586685686 has 64 divisors (see below), whose sum is σ = 1512867283200. Its totient is φ = 206002742400.

The previous prime is 686586685607. The next prime is 686586685699.

686586685686 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×686586685686² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2610145 + ... + 2861123.

It is an arithmetic number, because the mean of its divisors is an integer number (23638551300).

Almost surely, 2^686586685686 is an apocalyptic number.

686586685686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

686586685686 is an abundant number, since it is smaller than the sum of its proper divisors (826280597514).

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

686586685686 is a wasteful number, since it uses less digits than its factorization.

686586685686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251405.

The product of its digits is 4777574400, while the sum is 78.

The spelling of 686586685686 in words is "six hundred eighty-six billion, five hundred eighty-six million, six hundred eighty-five thousand, six hundred eighty-six".