166834747217 has 2 divisors, whose sum is σ = 166834747218. Its totient is φ = 166834747216.

The previous prime is 166834747127. The next prime is 166834747243. The reversal of 166834747217 is 712747438661.

Together with previous prime (166834747127) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97391429776 + 69443317441 = 312076^2 + 263521^2 .

It is a cyclic number.

It is not a de Polignac number, because 166834747217 - 2¹⁰ = 166834746193 is a prime.

It is not a weakly prime, because it can be changed into another prime (166834747297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83417373608 + 83417373609.

It is an arithmetic number, because the mean of its divisors is an integer number (83417373609).

Almost surely, 2^166834747217 is an apocalyptic number.

It is an amenable number.

166834747217 is a deficient number, since it is larger than the sum of its proper divisors (1).

166834747217 is an equidigital number, since it uses as much as digits as its factorization.

166834747217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 56.

The spelling of 166834747217 in words is "one hundred sixty-six billion, eight hundred thirty-four million, seven hundred forty-seven thousand, two hundred seventeen".