686488884685 has 32 divisors (see below), whose sum is σ = 829866166272. Its totient is φ = 545158871040.

The previous prime is 686488884659. The next prime is 686488884707. The reversal of 686488884685 is 586488884686.

It is a de Polignac number, because none of the positive numbers 2^k-686488884685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 622382844 + ... + 622383946.

It is an arithmetic number, because the mean of its divisors is an integer number (25933317696).

Almost surely, 2^686488884685 is an apocalyptic number.

It is an amenable number.

686488884685 is a deficient number, since it is larger than the sum of its proper divisors (143377281587).

686488884685 is a wasteful number, since it uses less digits than its factorization.

686488884685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733.

The product of its digits is 4529848320, while the sum is 79.

Subtracting from 686488884685 its reverse (586488884686), we obtain a palindrome (99999999999).

The spelling of 686488884685 in words is "six hundred eighty-six billion, four hundred eighty-eight million, eight hundred eighty-four thousand, six hundred eighty-five".