684668716393 has 2 divisors, whose sum is σ = 684668716394. Its totient is φ = 684668716392.

The previous prime is 684668716367. The next prime is 684668716421. The reversal of 684668716393 is 393617866486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651809178409 + 32859537984 = 807347^2 + 181272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684668716393 is a prime.

It is not a weakly prime, because it can be changed into another prime (684668714393) 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 as a sum of consecutive naturals, namely, 342334358196 + 342334358197.

It is an arithmetic number, because the mean of its divisors is an integer number (342334358197).

Almost surely, 2^684668716393 is an apocalyptic number.

It is an amenable number.

684668716393 is a deficient number, since it is larger than the sum of its proper divisors (1).

684668716393 is an equidigital number, since it uses as much as digits as its factorization.

684668716393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188116992, while the sum is 67.

The spelling of 684668716393 in words is "six hundred eighty-four billion, six hundred sixty-eight million, seven hundred sixteen thousand, three hundred ninety-three".