166606249 has 4 divisors (see below), whose sum is σ = 167452164. Its totient is φ = 165760336.

The previous prime is 166606243. The next prime is 166606261. The reversal of 166606249 is 942606661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164660224 + 1946025 = 12832^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 166606249 - 2²³ = 158217641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166606243) 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, 422662 + ... + 423055.

It is an arithmetic number, because the mean of its divisors is an integer number (41863041).

Almost surely, 2^166606249 is an apocalyptic number.

It is an amenable number.

166606249 is a deficient number, since it is larger than the sum of its proper divisors (845915).

166606249 is an equidigital number, since it uses as much as digits as its factorization.

166606249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845914.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 166606249 is about 12907.6043090885. The cubic root of 166606249 is about 550.2547018655.

The spelling of 166606249 in words is "one hundred sixty-six million, six hundred six thousand, two hundred forty-nine".