686220921584 has 40 divisors (see below), whose sum is σ = 1450477221552. Its totient is φ = 311906616320.

The previous prime is 686220921553. The next prime is 686220921593. The reversal of 686220921584 is 485129022686.

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, 5843672 + ... + 5959944.

Almost surely, 2^686220921584 is an apocalyptic number.

It is an amenable number.

686220921584 is an abundant number, since it is smaller than the sum of its proper divisors (764256299968).

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

686220921584 is a wasteful number, since it uses less digits than its factorization.

686220921584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149825 (or 149819 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 686220921584 in words is "six hundred eighty-six billion, two hundred twenty million, nine hundred twenty-one thousand, five hundred eighty-four".