66228079217 has 2 divisors, whose sum is σ = 66228079218. Its totient is φ = 66228079216.

The previous prime is 66228079199. The next prime is 66228079249. The reversal of 66228079217 is 71297082266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41666607376 + 24561471841 = 204124^2 + 156721^2 .

It is a cyclic number.

It is not a de Polignac number, because 66228079217 - 2¹⁴ = 66228062833 is a prime.

It is not a weakly prime, because it can be changed into another prime (66228019217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33114039608 + 33114039609.

It is an arithmetic number, because the mean of its divisors is an integer number (33114039609).

Almost surely, 2^66228079217 is an apocalyptic number.

It is an amenable number.

66228079217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66228079217 is an equidigital number, since it uses as much as digits as its factorization.

66228079217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 66228079217 in words is "sixty-six billion, two hundred twenty-eight million, seventy-nine thousand, two hundred seventeen".