166969171 has 2 divisors, whose sum is σ = 166969172. Its totient is φ = 166969170.

The previous prime is 166969141. The next prime is 166969183. The reversal of 166969171 is 171969661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166969171 is a prime.

It is not a weakly prime, because it can be changed into another prime (166969111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83484585 + 83484586.

It is an arithmetic number, because the mean of its divisors is an integer number (83484586).

Almost surely, 2^166969171 is an apocalyptic number.

166969171 is a deficient number, since it is larger than the sum of its proper divisors (1).

166969171 is an equidigital number, since it uses as much as digits as its factorization.

166969171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 166969171 is about 12921.6551184436. The cubic root of 166969171 is about 550.6539560153.

The spelling of 166969171 in words is "one hundred sixty-six million, nine hundred sixty-nine thousand, one hundred seventy-one".