686712820216 has 32 divisors (see below), whose sum is σ = 1320013583280. Its totient is φ = 334722182400.

The previous prime is 686712820193. The next prime is 686712820273. The reversal of 686712820216 is 612028217686.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 686712820216.

It is a congruent number.

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, 387411 + ... + 1234306.

Almost surely, 2^686712820216 is an apocalyptic number.

It is an amenable number.

686712820216 is a deficient number, since it is larger than the sum of its proper divisors (633300763064).

686712820216 is a wasteful number, since it uses less digits than its factorization.

686712820216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623055 (or 1623051 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 686712820216 in words is "six hundred eighty-six billion, seven hundred twelve million, eight hundred twenty thousand, two hundred sixteen".