684668716394 has 16 divisors (see below), whose sum is σ = 1106161808640. Its totient is φ = 315955661040.

The previous prime is 684668716393. The next prime is 684668716421. The reversal of 684668716394 is 493617866486.

It is not an unprimeable number, because it can be changed into a prime (684668716393) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1701614 + ... + 2065145.

It is an arithmetic number, because the mean of its divisors is an integer number (69135113040).

Almost surely, 2^684668716394 is an apocalyptic number.

684668716394 is a deficient number, since it is larger than the sum of its proper divisors (421493092246).

684668716394 is a wasteful number, since it uses less digits than its factorization.

684668716394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773765.

The product of its digits is 250822656, while the sum is 68.

The spelling of 684668716394 in words is "six hundred eighty-four billion, six hundred sixty-eight million, seven hundred sixteen thousand, three hundred ninety-four".