685778653682 has 16 divisors (see below), whose sum is σ = 1034677652640. Its totient is φ = 340891885152.

The previous prime is 685778653663. The next prime is 685778653711. The reversal of 685778653682 is 286356877586.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1207988 + ... + 1682495.

It is an arithmetic number, because the mean of its divisors is an integer number (64667353290).

Almost surely, 2^685778653682 is an apocalyptic number.

685778653682 is a deficient number, since it is larger than the sum of its proper divisors (348898998958).

685778653682 is a wasteful number, since it uses less digits than its factorization.

685778653682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891177.

The product of its digits is 812851200, while the sum is 71.

The spelling of 685778653682 in words is "six hundred eighty-five billion, seven hundred seventy-eight million, six hundred fifty-three thousand, six hundred eighty-two".