684066769 has 2 divisors, whose sum is σ = 684066770. Its totient is φ = 684066768.

The previous prime is 684066743. The next prime is 684066793. The reversal of 684066769 is 967660486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658179025 + 25887744 = 25655^2 + 5088^2 .

It is a cyclic number.

It is not a de Polignac number, because 684066769 - 2⁷ = 684066641 is a prime.

It is a super-2 number, since 2×684066769² = 935894688900198722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684066269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342033384 + 342033385.

It is an arithmetic number, because the mean of its divisors is an integer number (342033385).

Almost surely, 2^684066769 is an apocalyptic number.

It is an amenable number.

684066769 is a deficient number, since it is larger than the sum of its proper divisors (1).

684066769 is an equidigital number, since it uses as much as digits as its factorization.

684066769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 684066769 is about 26154.6701183555. The cubic root of 684066769 is about 881.1154798006.

The spelling of 684066769 in words is "six hundred eighty-four million, sixty-six thousand, seven hundred sixty-nine".