686303815680 has 768 divisors, whose sum is σ = 2845402560000. Its totient is φ = 156847767552.

The previous prime is 686303815661. The next prime is 686303815699. The reversal of 686303815680 is 86518303686.

It is an interprime number because it is at equal distance from previous prime (686303815661) and next prime (686303815699).

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 94829022 + ... + 94836258.

It is an arithmetic number, because the mean of its divisors is an integer number (3704951250).

Almost surely, 2^686303815680 is an apocalyptic number.

686303815680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686303815680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1422701280000).

686303815680 is an abundant number, since it is smaller than the sum of its proper divisors (2159098744320).

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

686303815680 is an equidigital number, since it uses as much as digits as its factorization.

686303815680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7294 (or 7254 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 686303815680 in words is "six hundred eighty-six billion, three hundred three million, eight hundred fifteen thousand, six hundred eighty".