16661052747217 has 2 divisors, whose sum is σ = 16661052747218. Its totient is φ = 16661052747216.

The previous prime is 16661052747193. The next prime is 16661052747271. The reversal of 16661052747217 is 71274725016661.

16661052747217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (16661052747271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9031972344976 + 7629080402241 = 3005324^2 + 2762079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661052747217 is a prime.

It is not a weakly prime, because it can be changed into another prime (16661052748217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330526373608 + 8330526373609.

It is an arithmetic number, because the mean of its divisors is an integer number (8330526373609).

Almost surely, 2^{16661052747217} is an apocalyptic number.

It is an amenable number.

16661052747217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661052747217 is an equidigital number, since it uses as much as digits as its factorization.

16661052747217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 16661052747217 in words is "sixteen trillion, six hundred sixty-one billion, fifty-two million, seven hundred forty-seven thousand, two hundred seventeen".