166051271 has 4 divisors (see below), whose sum is σ = 170101344. Its totient is φ = 162001200.

The previous prime is 166051253. The next prime is 166051289. The reversal of 166051271 is 172150661.

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

It is an interprime number because it is at equal distance from previous prime (166051253) and next prime (166051289).

It is a cyclic number.

It is not a de Polignac number, because 166051271 - 2¹⁴ = 166034887 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 (166051231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2024975 + ... + 2025056.

It is an arithmetic number, because the mean of its divisors is an integer number (42525336).

Almost surely, 2^166051271 is an apocalyptic number.

166051271 is a deficient number, since it is larger than the sum of its proper divisors (4050073).

166051271 is an equidigital number, since it uses as much as digits as its factorization.

166051271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050072.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 166051271 is about 12886.0882737936. The cubic root of 166051271 is about 549.6430422087.

The spelling of 166051271 in words is "one hundred sixty-six million, fifty-one thousand, two hundred seventy-one".