685809263 has 2 divisors, whose sum is σ = 685809264. Its totient is φ = 685809262.

The previous prime is 685809247. The next prime is 685809277. The reversal of 685809263 is 362908586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685809263 - 2⁴ = 685809247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685809283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342904631 + 342904632.

It is an arithmetic number, because the mean of its divisors is an integer number (342904632).

Almost surely, 2^685809263 is an apocalyptic number.

685809263 is a deficient number, since it is larger than the sum of its proper divisors (1).

685809263 is an equidigital number, since it uses as much as digits as its factorization.

685809263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 685809263 is about 26187.9602680316. The cubic root of 685809263 is about 881.8629880430.

The spelling of 685809263 in words is "six hundred eighty-five million, eight hundred nine thousand, two hundred sixty-three".