685504223 has 2 divisors, whose sum is σ = 685504224. Its totient is φ = 685504222.

The previous prime is 685504189. The next prime is 685504231. The reversal of 685504223 is 322405586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685504223 - 2⁶ = 685504159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685504123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342752111 + 342752112.

It is an arithmetic number, because the mean of its divisors is an integer number (342752112).

Almost surely, 2^685504223 is an apocalyptic number.

685504223 is a deficient number, since it is larger than the sum of its proper divisors (1).

685504223 is an equidigital number, since it uses as much as digits as its factorization.

685504223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 685504223 is about 26182.1355698881. The cubic root of 685504223 is about 881.7322211795.

The spelling of 685504223 in words is "six hundred eighty-five million, five hundred four thousand, two hundred twenty-three".