685222858013 has 2 divisors, whose sum is σ = 685222858014. Its totient is φ = 685222858012.

The previous prime is 685222858007. The next prime is 685222858039. The reversal of 685222858013 is 310858222586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508350462169 + 176872395844 = 712987^2 + 420562^2 .

It is a cyclic number.

It is not a de Polignac number, because 685222858013 - 2³² = 680927890717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685222858003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342611429006 + 342611429007.

It is an arithmetic number, because the mean of its divisors is an integer number (342611429007).

Almost surely, 2^685222858013 is an apocalyptic number.

It is an amenable number.

685222858013 is a deficient number, since it is larger than the sum of its proper divisors (1).

685222858013 is an equidigital number, since it uses as much as digits as its factorization.

685222858013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1843200, while the sum is 50.

The spelling of 685222858013 in words is "six hundred eighty-five billion, two hundred twenty-two million, eight hundred fifty-eight thousand, thirteen".