686712820218 has 16 divisors (see below), whose sum is σ = 1373449996800. Its totient is φ = 228900214016.

The previous prime is 686712820193. The next prime is 686712820273. The reversal of 686712820218 is 812028217686.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637530 + ... + 1334117.

It is an arithmetic number, because the mean of its divisors is an integer number (85840624800).

Almost surely, 2^686712820218 is an apocalyptic number.

686712820218 is an abundant number, since it is smaller than the sum of its proper divisors (686737176582).

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

686712820218 is a wasteful number, since it uses less digits than its factorization.

686712820218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029701.

The product of its (nonzero) digits is 1032192, while the sum is 51.

The spelling of 686712820218 in words is "six hundred eighty-six billion, seven hundred twelve million, eight hundred twenty thousand, two hundred eighteen".