686868799488 has 336 divisors, whose sum is σ = 1915757245440. Its totient is φ = 218865991680.

The previous prime is 686868799447. The next prime is 686868799517. The reversal of 686868799488 is 884997868686.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2999426958 + ... + 2999427186.

Almost surely, 2^686868799488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686868799488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957878622720).

686868799488 is an abundant number, since it is smaller than the sum of its proper divisors (1228888445952).

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

686868799488 is a wasteful number, since it uses less digits than its factorization.

686868799488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 392 counting only the distinct ones).

The product of its digits is 16052649984, while the sum is 87.

The spelling of 686868799488 in words is "six hundred eighty-six billion, eight hundred sixty-eight million, seven hundred ninety-nine thousand, four hundred eighty-eight".