686247742686 has 16 divisors (see below), whose sum is σ = 1497267802368. Its totient is φ = 207953861400.

The previous prime is 686247742679. The next prime is 686247742703.

686247742686 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 10397693071 = 686247742686 / (6 + 8 + 6 + 2 + 4 + 7 + 7 + 4 + 2 + 6 + 8 + 6).

It is a Curzon number.

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, 5198846470 + ... + 5198846601.

It is an arithmetic number, because the mean of its divisors is an integer number (93579237648).

Almost surely, 2^686247742686 is an apocalyptic number.

686247742686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

686247742686 is an abundant number, since it is smaller than the sum of its proper divisors (811020059682).

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

686247742686 is a wasteful number, since it uses less digits than its factorization.

686247742686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397693087.

The product of its digits is 260112384, while the sum is 66.

The spelling of 686247742686 in words is "six hundred eighty-six billion, two hundred forty-seven million, seven hundred forty-two thousand, six hundred eighty-six".