166660117 has 4 divisors (see below), whose sum is σ = 179480140. Its totient is φ = 153840096.

The previous prime is 166660051. The next prime is 166660127. The reversal of 166660117 is 711066661.

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 86843761 + 79816356 = 9319^2 + 8934^2 .

It is a cyclic number.

It is not a de Polignac number, because 166660117 - 2⁷ = 166659989 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 (166660127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6409992 + ... + 6410017.

It is an arithmetic number, because the mean of its divisors is an integer number (44870035).

Almost surely, 2^166660117 is an apocalyptic number.

It is an amenable number.

166660117 is a deficient number, since it is larger than the sum of its proper divisors (12820023).

166660117 is a wasteful number, since it uses less digits than its factorization.

166660117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12820022.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 166660117 is about 12909.6908173666. The cubic root of 166660117 is about 550.3139992137.

The spelling of 166660117 in words is "one hundred sixty-six million, six hundred sixty thousand, one hundred seventeen".