166004191 has 2 divisors, whose sum is σ = 166004192. Its totient is φ = 166004190.

The previous prime is 166004183. The next prime is 166004239. The reversal of 166004191 is 191400661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166004191 - 2³ = 166004183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166004171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83002095 + 83002096.

It is an arithmetic number, because the mean of its divisors is an integer number (83002096).

Almost surely, 2^166004191 is an apocalyptic number.

166004191 is a deficient number, since it is larger than the sum of its proper divisors (1).

166004191 is an equidigital number, since it uses as much as digits as its factorization.

166004191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 166004191 is about 12884.2613680412. The cubic root of 166004191 is about 549.5910911049.

The spelling of 166004191 in words is "one hundred sixty-six million, four thousand, one hundred ninety-one".