685746818864 has 20 divisors (see below), whose sum is σ = 1341789261360. Its totient is φ = 339478622400.

The previous prime is 685746818837. The next prime is 685746818927. The reversal of 685746818864 is 468818647586.

685746818864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212172524 + ... + 212175755.

It is an arithmetic number, because the mean of its divisors is an integer number (67089463068).

Almost surely, 2^685746818864 is an apocalyptic number.

It is an amenable number.

685746818864 is a deficient number, since it is larger than the sum of its proper divisors (656042442496).

685746818864 is a wasteful number, since it uses less digits than its factorization.

685746818864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424348388 (or 424348382 counting only the distinct ones).

The product of its digits is 495452160, while the sum is 71.

The spelling of 685746818864 in words is "six hundred eighty-five billion, seven hundred forty-six million, eight hundred eighteen thousand, eight hundred sixty-four".