166837217 has 2 divisors, whose sum is σ = 166837218. Its totient is φ = 166837216.

The previous prime is 166837211. The next prime is 166837219. The reversal of 166837217 is 712738661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166823056 + 14161 = 12916^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 166837217 - 2¹⁰ = 166836193 is a prime.

Together with 166837219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166837211) 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, 83418608 + 83418609.

It is an arithmetic number, because the mean of its divisors is an integer number (83418609).

Almost surely, 2^166837217 is an apocalyptic number.

It is an amenable number.

166837217 is a deficient number, since it is larger than the sum of its proper divisors (1).

166837217 is an equidigital number, since it uses as much as digits as its factorization.

166837217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 166837217 is about 12916.5481844028. The cubic root of 166837217 is about 550.5088590868.

The spelling of 166837217 in words is "one hundred sixty-six million, eight hundred thirty-seven thousand, two hundred seventeen".