166566247 has 2 divisors, whose sum is σ = 166566248. Its totient is φ = 166566246.

The previous prime is 166566233. The next prime is 166566269. The reversal of 166566247 is 742665661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (742665661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166566247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166566287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83283123 + 83283124.

It is an arithmetic number, because the mean of its divisors is an integer number (83283124).

Almost surely, 2^166566247 is an apocalyptic number.

166566247 is a deficient number, since it is larger than the sum of its proper divisors (1).

166566247 is an equidigital number, since it uses as much as digits as its factorization.

166566247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The square root of 166566247 is about 12906.0546643814. The cubic root of 166566247 is about 550.2106597991.

The spelling of 166566247 in words is "one hundred sixty-six million, five hundred sixty-six thousand, two hundred forty-seven".