166565211 has 8 divisors (see below), whose sum is σ = 223057680. Its totient is φ = 110558112.

The previous prime is 166565209. The next prime is 166565213. The reversal of 166565211 is 112565661.

It is an interprime number because it is at equal distance from previous prime (166565209) and next prime (166565213).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166565211 - 2¹ = 166565209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166565213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120540 + ... + 121913.

It is an arithmetic number, because the mean of its divisors is an integer number (27882210).

Almost surely, 2^166565211 is an apocalyptic number.

166565211 is a deficient number, since it is larger than the sum of its proper divisors (56492469).

166565211 is a wasteful number, since it uses less digits than its factorization.

166565211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242685.

The product of its digits is 10800, while the sum is 33.

The square root of 166565211 is about 12906.0145281183. The cubic root of 166565211 is about 550.2095190730.

The spelling of 166565211 in words is "one hundred sixty-six million, five hundred sixty-five thousand, two hundred eleven".