166494189 has 4 divisors (see below), whose sum is σ = 221992256. Its totient is φ = 110996124.

The previous prime is 166494179. The next prime is 166494199. The reversal of 166494189 is 981494661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (166494179) and next prime (166494199).

It is not a de Polignac number, because 166494189 - 2¹⁶ = 166428653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166494179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27749029 + ... + 27749034.

It is an arithmetic number, because the mean of its divisors is an integer number (55498064).

Almost surely, 2^166494189 is an apocalyptic number.

It is an amenable number.

166494189 is a deficient number, since it is larger than the sum of its proper divisors (55498067).

166494189 is an equidigital number, since it uses as much as digits as its factorization.

166494189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55498066.

The product of its digits is 373248, while the sum is 48.

The square root of 166494189 is about 12903.2627269230. The cubic root of 166494189 is about 550.1313063906.

The spelling of 166494189 in words is "one hundred sixty-six million, four hundred ninety-four thousand, one hundred eighty-nine".