166489413 has 4 divisors (see below), whose sum is σ = 221985888. Its totient is φ = 110992940.

The previous prime is 166489333. The next prime is 166489423. The reversal of 166489413 is 314984661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 314984661 = 3 ⋅104994887.

It is a cyclic number.

It is not a de Polignac number, because 166489413 - 2²⁶ = 99380549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166489423) 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, 27748233 + ... + 27748238.

It is an arithmetic number, because the mean of its divisors is an integer number (55496472).

Almost surely, 2^166489413 is an apocalyptic number.

It is an amenable number.

166489413 is a deficient number, since it is larger than the sum of its proper divisors (55496475).

166489413 is an equidigital number, since it uses as much as digits as its factorization.

166489413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55496474.

The product of its digits is 124416, while the sum is 42.

The square root of 166489413 is about 12903.0776561253. The cubic root of 166489413 is about 550.1260460424.

The spelling of 166489413 in words is "one hundred sixty-six million, four hundred eighty-nine thousand, four hundred thirteen".