166261171 has 2 divisors, whose sum is σ = 166261172. Its totient is φ = 166261170.

The previous prime is 166261169. The next prime is 166261211. The reversal of 166261171 is 171162661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166261171 - 2¹ = 166261169 is a prime.

Together with 166261169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166661171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83130585 + 83130586.

It is an arithmetic number, because the mean of its divisors is an integer number (83130586).

Almost surely, 2^166261171 is an apocalyptic number.

166261171 is a deficient number, since it is larger than the sum of its proper divisors (1).

166261171 is an equidigital number, since it uses as much as digits as its factorization.

166261171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 166261171 is about 12894.2301437503. The cubic root of 166261171 is about 549.8745399786.

The spelling of 166261171 in words is "one hundred sixty-six million, two hundred sixty-one thousand, one hundred seventy-one".