166336170072209 has 2 divisors, whose sum is σ = 166336170072210. Its totient is φ = 166336170072208.

The previous prime is 166336170072179. The next prime is 166336170072337. The reversal of 166336170072209 is 902270071633661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108354463329025 + 57981706743184 = 10409345^2 + 7614572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166336170072209 is a prime.

It is not a weakly prime, because it can be changed into another prime (166336170072509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83168085036104 + 83168085036105.

It is an arithmetic number, because the mean of its divisors is an integer number (83168085036105).

Almost surely, 2^{166336170072209} is an apocalyptic number.

It is an amenable number.

166336170072209 is a deficient number, since it is larger than the sum of its proper divisors (1).

166336170072209 is an equidigital number, since it uses as much as digits as its factorization.

166336170072209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 53.

The spelling of 166336170072209 in words is "one hundred sixty-six trillion, three hundred thirty-six billion, one hundred seventy million, seventy-two thousand, two hundred nine".