8189780568217 has 2 divisors, whose sum is σ = 8189780568218. Its totient is φ = 8189780568216.

The previous prime is 8189780568169. The next prime is 8189780568257. The reversal of 8189780568217 is 7128650879818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7894588292361 + 295192275856 = 2809731^2 + 543316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8189780568217 is a prime.

It is not a weakly prime, because it can be changed into another prime (8189780568257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4094890284108 + 4094890284109.

It is an arithmetic number, because the mean of its divisors is an integer number (4094890284109).

Almost surely, 2^{8189780568217} is an apocalyptic number.

It is an amenable number.

8189780568217 is a deficient number, since it is larger than the sum of its proper divisors (1).

8189780568217 is an equidigital number, since it uses as much as digits as its factorization.

8189780568217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108380160, while the sum is 70.

The spelling of 8189780568217 in words is "eight trillion, one hundred eighty-nine billion, seven hundred eighty million, five hundred sixty-eight thousand, two hundred seventeen".