6704681521 has 2 divisors, whose sum is σ = 6704681522. Its totient is φ = 6704681520.

The previous prime is 6704681513. The next prime is 6704681531. The reversal of 6704681521 is 1251864076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6582888225 + 121793296 = 81135^2 + 11036^2 .

It is a cyclic number.

It is not a de Polignac number, because 6704681521 - 2³ = 6704681513 is a prime.

It is not a weakly prime, because it can be changed into another prime (6704681531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3352340760 + 3352340761.

It is an arithmetic number, because the mean of its divisors is an integer number (3352340761).

Almost surely, 2^6704681521 is an apocalyptic number.

It is an amenable number.

6704681521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6704681521 is an equidigital number, since it uses as much as digits as its factorization.

6704681521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 6704681521 is about 81882.1196660174. The cubic root of 6704681521 is about 1885.6426143840.

The spelling of 6704681521 in words is "six billion, seven hundred four million, six hundred eighty-one thousand, five hundred twenty-one".