166668171 has 16 divisors (see below), whose sum is σ = 235334400. Its totient is φ = 104627808.

The previous prime is 166668137. The next prime is 166668241. The reversal of 166668171 is 171866661.

It is not a de Polignac number, because 166668171 - 2¹⁹ = 166143883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166668101) 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 in 15 ways as a sum of consecutive naturals, for example, 765 + ... + 18273.

It is an arithmetic number, because the mean of its divisors is an integer number (14708400).

Almost surely, 2^166668171 is an apocalyptic number.

166668171 is a deficient number, since it is larger than the sum of its proper divisors (68666229).

166668171 is a wasteful number, since it uses less digits than its factorization.

166668171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17698.

The product of its digits is 72576, while the sum is 42.

The square root of 166668171 is about 12910.0027498061. The cubic root of 166668171 is about 550.3228638772.

The spelling of 166668171 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, one hundred seventy-one".