66264773521673 has 2 divisors, whose sum is σ = 66264773521674. Its totient is φ = 66264773521672.

The previous prime is 66264773521663. The next prime is 66264773521747. The reversal of 66264773521673 is 37612537746266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65819259990649 + 445513531024 = 8112907^2 + 667468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66264773521673 is a prime.

It is not a weakly prime, because it can be changed into another prime (66264773521663) 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, 33132386760836 + 33132386760837.

It is an arithmetic number, because the mean of its divisors is an integer number (33132386760837).

Almost surely, 2^{66264773521673} is an apocalyptic number.

It is an amenable number.

66264773521673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66264773521673 is an equidigital number, since it uses as much as digits as its factorization.

66264773521673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320060160, while the sum is 65.

The spelling of 66264773521673 in words is "sixty-six trillion, two hundred sixty-four billion, seven hundred seventy-three million, five hundred twenty-one thousand, six hundred seventy-three".