686685188684 has 18 divisors (see below), whose sum is σ = 1320875849412. Its totient is φ = 312129631000.

The previous prime is 686685188669. The next prime is 686685188713. The reversal of 686685188684 is 486881586686.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 709385042 + ... + 709386009.

It is an arithmetic number, because the mean of its divisors is an integer number (73381991634).

Almost surely, 2^686685188684 is an apocalyptic number.

It is an amenable number.

686685188684 is a deficient number, since it is larger than the sum of its proper divisors (634190660728).

686685188684 is a wasteful number, since it uses less digits than its factorization.

686685188684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418771077 (or 1418771064 counting only the distinct ones).

The product of its digits is 849346560, while the sum is 74.

The spelling of 686685188684 in words is "six hundred eighty-six billion, six hundred eighty-five million, one hundred eighty-eight thousand, six hundred eighty-four".