6664443197 has 2 divisors, whose sum is σ = 6664443198. Its totient is φ = 6664443196.

The previous prime is 6664443151. The next prime is 6664443221. The reversal of 6664443197 is 7913444666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6651054916 + 13388281 = 81554^2 + 3659^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664443197 - 2⁶ = 6664443133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664443697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332221598 + 3332221599.

It is an arithmetic number, because the mean of its divisors is an integer number (3332221599).

Almost surely, 2^6664443197 is an apocalyptic number.

It is an amenable number.

6664443197 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664443197 is an equidigital number, since it uses as much as digits as its factorization.

6664443197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 50.

The square root of 6664443197 is about 81636.0410419320. The cubic root of 6664443197 is about 1881.8627979896.

The spelling of 6664443197 in words is "six billion, six hundred sixty-four million, four hundred forty-three thousand, one hundred ninety-seven".