166672189 has 2 divisors, whose sum is σ = 166672190. Its totient is φ = 166672188.

The previous prime is 166672141. The next prime is 166672201. The reversal of 166672189 is 981276661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140067225 + 26604964 = 11835^2 + 5158^2 .

It is an emirp because it is prime and its reverse (981276661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166672189 - 2¹³ = 166663997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166673189) 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, 83336094 + 83336095.

It is an arithmetic number, because the mean of its divisors is an integer number (83336095).

Almost surely, 2^166672189 is an apocalyptic number.

It is an amenable number.

166672189 is a deficient number, since it is larger than the sum of its proper divisors (1).

166672189 is an equidigital number, since it uses as much as digits as its factorization.

166672189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 166672189 is about 12910.1583646367. The cubic root of 166672189 is about 550.3272861963.

The spelling of 166672189 in words is "one hundred sixty-six million, six hundred seventy-two thousand, one hundred eighty-nine".