685778653684 has 24 divisors (see below), whose sum is σ = 1204086691808. Its totient is φ = 341755757280.

The previous prime is 685778653663. The next prime is 685778653711. The reversal of 685778653684 is 486356877586.

It is a congruent number.

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, 1235134 + ... + 1702090.

Almost surely, 2^685778653684 is an apocalyptic number.

It is an amenable number.

685778653684 is a deficient number, since it is larger than the sum of its proper divisors (518308038124).

685778653684 is a wasteful number, since it uses less digits than its factorization.

685778653684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468175 (or 468173 counting only the distinct ones).

The product of its digits is 1625702400, while the sum is 73.

The spelling of 685778653684 in words is "six hundred eighty-five billion, seven hundred seventy-eight million, six hundred fifty-three thousand, six hundred eighty-four".