686191964916 has 12 divisors (see below), whose sum is σ = 1601114584832. Its totient is φ = 228730654968.

The previous prime is 686191964891. The next prime is 686191964921. The reversal of 686191964916 is 619469191686.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28591331860 + ... + 28591331883.

Almost surely, 2^686191964916 is an apocalyptic number.

It is an amenable number.

686191964916 is an abundant number, since it is smaller than the sum of its proper divisors (914922619916).

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

686191964916 is a wasteful number, since it uses less digits than its factorization.

686191964916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57182663750 (or 57182663748 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 66.

The spelling of 686191964916 in words is "six hundred eighty-six billion, one hundred ninety-one million, nine hundred sixty-four thousand, nine hundred sixteen".