166191271 has 8 divisors (see below), whose sum is σ = 175089200. Its totient is φ = 157308480.

The previous prime is 166191253. The next prime is 166191281. The reversal of 166191271 is 172191661.

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

It is a cyclic number.

It is not a de Polignac number, because 166191271 - 2¹⁹ = 165666983 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 (166191281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24091 + ... + 30211.

It is an arithmetic number, because the mean of its divisors is an integer number (21886150).

Almost surely, 2^166191271 is an apocalyptic number.

166191271 is a deficient number, since it is larger than the sum of its proper divisors (8897929).

166191271 is a wasteful number, since it uses less digits than its factorization.

166191271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7569.

The product of its digits is 4536, while the sum is 34.

The square root of 166191271 is about 12891.5193441270. The cubic root of 166191271 is about 549.7974692313.

The spelling of 166191271 in words is "one hundred sixty-six million, one hundred ninety-one thousand, two hundred seventy-one".