166163271 has 4 divisors (see below), whose sum is σ = 221551032. Its totient is φ = 110775512.

The previous prime is 166163237. The next prime is 166163273. The reversal of 166163271 is 172361661.

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

It is a cyclic number.

It is not a de Polignac number, because 166163271 - 2¹⁰ = 166162247 is a prime.

It is a super-2 number, since 2×166163271² = 55220465258838882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166163273) 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 3 ways as a sum of consecutive naturals, for example, 27693876 + ... + 27693881.

It is an arithmetic number, because the mean of its divisors is an integer number (55387758).

Almost surely, 2^166163271 is an apocalyptic number.

166163271 is a deficient number, since it is larger than the sum of its proper divisors (55387761).

166163271 is an equidigital number, since it uses as much as digits as its factorization.

166163271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55387760.

The product of its digits is 9072, while the sum is 33.

The square root of 166163271 is about 12890.4333131202. The cubic root of 166163271 is about 549.7665907669.

The spelling of 166163271 in words is "one hundred sixty-six million, one hundred sixty-three thousand, two hundred seventy-one".