166717271 has 16 divisors (see below), whose sum is σ = 199524864. Its totient is φ = 136201824.

The previous prime is 166717261. The next prime is 166717279. The reversal of 166717271 is 172717661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166717271 - 2²⁶ = 99608407 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166717279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47741 + ... + 51113.

It is an arithmetic number, because the mean of its divisors is an integer number (12470304).

Almost surely, 2^166717271 is an apocalyptic number.

166717271 is a deficient number, since it is larger than the sum of its proper divisors (32807593).

166717271 is a wasteful number, since it uses less digits than its factorization.

166717271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710.

The product of its digits is 24696, while the sum is 38.

The square root of 166717271 is about 12911.9042360141. The cubic root of 166717271 is about 550.3768997887.

The spelling of 166717271 in words is "one hundred sixty-six million, seven hundred seventeen thousand, two hundred seventy-one".