686143842244 has 27 divisors (see below), whose sum is σ = 1396816429743. Its totient is φ = 294056676648.

The previous prime is 686143842233. The next prime is 686143842259. The reversal of 686143842244 is 442248341686.

The square root of 686143842244 is 828338.

It is a perfect power (a square), and thus also a powerful number.

686143842244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 686143842191 and 686143842200.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11567149 + ... + 11626315.

Almost surely, 2^686143842244 is an apocalyptic number.

686143842244 is the 828338-th square number.

It is an amenable number.

686143842244 is an abundant number, since it is smaller than the sum of its proper divisors (710672587499).

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

686143842244 is an frugal number, since it uses more digits than its factorization.

686143842244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118352 (or 59176 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 52.

The spelling of 686143842244 in words is "six hundred eighty-six billion, one hundred forty-three million, eight hundred forty-two thousand, two hundred forty-four".