685884622793 has 2 divisors, whose sum is σ = 685884622794. Its totient is φ = 685884622792.

The previous prime is 685884622757. The next prime is 685884622849. The reversal of 685884622793 is 397226488586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396190936969 + 289693685824 = 629437^2 + 538232^2 .

It is a cyclic number.

It is not a de Polignac number, because 685884622793 - 2³⁸ = 411006715849 is a prime.

It is not a weakly prime, because it can be changed into another prime (685884622733) 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, 342942311396 + 342942311397.

It is an arithmetic number, because the mean of its divisors is an integer number (342942311397).

Almost surely, 2^685884622793 is an apocalyptic number.

It is an amenable number.

685884622793 is a deficient number, since it is larger than the sum of its proper divisors (1).

685884622793 is an equidigital number, since it uses as much as digits as its factorization.

685884622793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 278691840, while the sum is 68.

The spelling of 685884622793 in words is "six hundred eighty-five billion, eight hundred eighty-four million, six hundred twenty-two thousand, seven hundred ninety-three".