685290665233 has 2 divisors, whose sum is σ = 685290665234. Its totient is φ = 685290665232.

The previous prime is 685290665177. The next prime is 685290665329. The reversal of 685290665233 is 332566092586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668417434624 + 16873230609 = 817568^2 + 129897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685290665233 is a prime.

It is not a weakly prime, because it can be changed into another prime (685290665333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342645332616 + 342645332617.

It is an arithmetic number, because the mean of its divisors is an integer number (342645332617).

Almost surely, 2^685290665233 is an apocalyptic number.

It is an amenable number.

685290665233 is a deficient number, since it is larger than the sum of its proper divisors (1).

685290665233 is an equidigital number, since it uses as much as digits as its factorization.

685290665233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13996800, while the sum is 55.

The spelling of 685290665233 in words is "six hundred eighty-five billion, two hundred ninety million, six hundred sixty-five thousand, two hundred thirty-three".