686117308393620 has 36 divisors (see below), whose sum is σ = 2081222502127860. Its totient is φ = 182964615571584.

The previous prime is 686117308393597. The next prime is 686117308393631. The reversal of 686117308393620 is 26393803711686.

686117308393620 is a `hidden beast` number, since 6 + 8 + 611 + 7 + 3 + 0 + 8 + 3 + 9 + 3 + 6 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 345144907861776 + 340972400531844 = 18578076^2 + 18465438^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1905881412025 + ... + 1905881412384.

Almost surely, 2^{686117308393620} is an apocalyptic number.

686117308393620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686117308393620 is an abundant number, since it is smaller than the sum of its proper divisors (1395105193734240).

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

686117308393620 is a wasteful number, since it uses less digits than its factorization.

686117308393620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811762824424 (or 3811762824419 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 686117308393620 in words is "six hundred eighty-six trillion, one hundred seventeen billion, three hundred eight million, three hundred ninety-three thousand, six hundred twenty".