67564644673 has 2 divisors, whose sum is σ = 67564644674. Its totient is φ = 67564644672.

The previous prime is 67564644607. The next prime is 67564644703. The reversal of 67564644673 is 37644646576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67564644624 + 49 = 259932^2 + 7^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67564644673 is a prime.

It is not a weakly prime, because it can be changed into another prime (67564644473) 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, 33782322336 + 33782322337.

It is an arithmetic number, because the mean of its divisors is an integer number (33782322337).

Almost surely, 2^67564644673 is an apocalyptic number.

It is an amenable number.

67564644673 is a deficient number, since it is larger than the sum of its proper divisors (1).

67564644673 is an equidigital number, since it uses as much as digits as its factorization.

67564644673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 58.

The spelling of 67564644673 in words is "sixty-seven billion, five hundred sixty-four million, six hundred forty-four thousand, six hundred seventy-three".