686660880798 has 16 divisors (see below), whose sum is σ = 1525913068560. Its totient is φ = 228886960248.

The previous prime is 686660880761. The next prime is 686660880817. The reversal of 686660880798 is 897088066686.

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, 6357971065 + ... + 6357971172.

It is an arithmetic number, because the mean of its divisors is an integer number (95369566785).

Almost surely, 2^686660880798 is an apocalyptic number.

686660880798 is an abundant number, since it is smaller than the sum of its proper divisors (839252187762).

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

686660880798 is a wasteful number, since it uses less digits than its factorization.

686660880798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12715942248 (or 12715942242 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 72.

The spelling of 686660880798 in words is "six hundred eighty-six billion, six hundred sixty million, eight hundred eighty thousand, seven hundred ninety-eight".