166628117 has 4 divisors (see below), whose sum is σ = 166657356. Its totient is φ = 166598880.

The previous prime is 166628093. The next prime is 166628153. The reversal of 166628117 is 711826661.

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 129185956 + 37442161 = 11366^2 + 6119^2 .

It is a cyclic number.

It is not a de Polignac number, because 166628117 - 2²⁴ = 149850901 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 (166628017) 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, 2984 + ... + 18497.

It is an arithmetic number, because the mean of its divisors is an integer number (41664339).

Almost surely, 2^166628117 is an apocalyptic number.

It is an amenable number.

166628117 is a deficient number, since it is larger than the sum of its proper divisors (29239).

166628117 is an equidigital number, since it uses as much as digits as its factorization.

166628117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29238.

The product of its digits is 24192, while the sum is 38.

The square root of 166628117 is about 12908.4513788448. The cubic root of 166628117 is about 550.2787754791.

The spelling of 166628117 in words is "one hundred sixty-six million, six hundred twenty-eight thousand, one hundred seventeen".