166134209 has 2 divisors, whose sum is σ = 166134210. Its totient is φ = 166134208.

The previous prime is 166134197. The next prime is 166134247. The reversal of 166134209 is 902431661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163123984 + 3010225 = 12772^2 + 1735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166134209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166134109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83067104 + 83067105.

It is an arithmetic number, because the mean of its divisors is an integer number (83067105).

Almost surely, 2^166134209 is an apocalyptic number.

It is an amenable number.

166134209 is a deficient number, since it is larger than the sum of its proper divisors (1).

166134209 is an equidigital number, since it uses as much as digits as its factorization.

166134209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 166134209 is about 12889.3059937298. The cubic root of 166134209 is about 549.7345374574.

The spelling of 166134209 in words is "one hundred sixty-six million, one hundred thirty-four thousand, two hundred nine".