685866329 has 2 divisors, whose sum is σ = 685866330. Its totient is φ = 685866328.

The previous prime is 685866301. The next prime is 685866353. The reversal of 685866329 is 923668586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680009929 + 5856400 = 26077^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 685866329 - 2⁸ = 685866073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (685866359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342933164 + 342933165.

It is an arithmetic number, because the mean of its divisors is an integer number (342933165).

Almost surely, 2^685866329 is an apocalyptic number.

It is an amenable number.

685866329 is a deficient number, since it is larger than the sum of its proper divisors (1).

685866329 is an equidigital number, since it uses as much as digits as its factorization.

685866329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 53.

The square root of 685866329 is about 26189.0497918500. The cubic root of 685866329 is about 881.8874472234.

The spelling of 685866329 in words is "six hundred eighty-five million, eight hundred sixty-six thousand, three hundred twenty-nine".