686219545808 has 20 divisors (see below), whose sum is σ = 1329567612420. Its totient is φ = 343105323264.

The previous prime is 686219545777. The next prime is 686219545861. The reversal of 686219545808 is 808545912686.

It can be written as a sum of positive squares in 2 ways, for example, as 274584384064 + 411635161744 = 524008^2 + 641588^2 .

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 1247966 + ... + 1711682.

It is an arithmetic number, because the mean of its divisors is an integer number (66478380621).

Almost surely, 2^686219545808 is an apocalyptic number.

It is an amenable number.

686219545808 is a deficient number, since it is larger than the sum of its proper divisors (643348066612).

686219545808 is a wasteful number, since it uses less digits than its factorization.

686219545808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556214 (or 556208 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 62.

The spelling of 686219545808 in words is "six hundred eighty-six billion, two hundred nineteen million, five hundred forty-five thousand, eight hundred eight".