166490171 has 2 divisors, whose sum is σ = 166490172. Its totient is φ = 166490170.

The previous prime is 166490147. The next prime is 166490213. The reversal of 166490171 is 171094661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166490171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166490111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83245085 + 83245086.

It is an arithmetic number, because the mean of its divisors is an integer number (83245086).

Almost surely, 2^166490171 is an apocalyptic number.

166490171 is a deficient number, since it is larger than the sum of its proper divisors (1).

166490171 is an equidigital number, since it uses as much as digits as its factorization.

166490171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 166490171 is about 12903.1070289291. The cubic root of 166490171 is about 550.1268809201.

It can be divided in two parts, 166490 and 171, that added together give a palindrome (166661).

The spelling of 166490171 in words is "one hundred sixty-six million, four hundred ninety thousand, one hundred seventy-one".