686942043648 has 160 divisors (see below), whose sum is σ = 2182428458496. Its totient is φ = 187735646208.

The previous prime is 686942043511. The next prime is 686942043659. The reversal of 686942043648 is 846340249686.

It is a junction number, because it is equal to n+sod(n) for n = 686942043591 and 686942043600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141611 + ... + 1636202.

Almost surely, 2^686942043648 is an apocalyptic number.

It is an amenable number.

686942043648 is an abundant number, since it is smaller than the sum of its proper divisors (1495486414848).

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

686942043648 is a wasteful number, since it uses less digits than its factorization.

686942043648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777864 (or 2777848 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 60.

The spelling of 686942043648 in words is "six hundred eighty-six billion, nine hundred forty-two million, forty-three thousand, six hundred forty-eight".