166641245 has 4 divisors (see below), whose sum is σ = 199969500. Its totient is φ = 133312992.

The previous prime is 166641217. The next prime is 166641263. The reversal of 166641245 is 542146661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542146661 = 7 ⋅77449523.

It can be written as a sum of positive squares in 2 ways, for example, as 92371321 + 74269924 = 9611^2 + 8618^2 .

It is a cyclic number.

It is not a de Polignac number, because 166641245 - 2¹⁶ = 166575709 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 16664120 + ... + 16664129.

It is an arithmetic number, because the mean of its divisors is an integer number (49992375).

Almost surely, 2^166641245 is an apocalyptic number.

It is an amenable number.

166641245 is a deficient number, since it is larger than the sum of its proper divisors (33328255).

166641245 is an equidigital number, since it uses as much as digits as its factorization.

166641245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33328254.

The product of its digits is 34560, while the sum is 35.

The square root of 166641245 is about 12908.9598728945. The cubic root of 166641245 is about 550.2932265618.

The spelling of 166641245 in words is "one hundred sixty-six million, six hundred forty-one thousand, two hundred forty-five".