685778653683 has 12 divisors (see below), whose sum is σ = 990583239360. Its totient is φ = 457179273936.

The previous prime is 685778653663. The next prime is 685778653711. The reversal of 685778653683 is 386356877586.

685778653683 is a `hidden beast` number, since 6 + 8 + 5 + 7 + 7 + 8 + 6 + 536 + 83 = 666.

It is not a de Polignac number, because 685778653683 - 2¹⁸ = 685778391539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685778653613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177685 + ... + 1184537.

It is an arithmetic number, because the mean of its divisors is an integer number (82548603280).

Almost surely, 2^685778653683 is an apocalyptic number.

685778653683 is a deficient number, since it is larger than the sum of its proper divisors (304804585677).

685778653683 is a wasteful number, since it uses less digits than its factorization.

685778653683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082538 (or 1082535 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 72.

The spelling of 685778653683 in words is "six hundred eighty-five billion, seven hundred seventy-eight million, six hundred fifty-three thousand, six hundred eighty-three".