166066259 has 2 divisors, whose sum is σ = 166066260. Its totient is φ = 166066258.

The previous prime is 166066253. The next prime is 166066273. The reversal of 166066259 is 952660661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166066259 - 2²⁰ = 165017683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166066253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83033129 + 83033130.

It is an arithmetic number, because the mean of its divisors is an integer number (83033130).

Almost surely, 2^166066259 is an apocalyptic number.

166066259 is a deficient number, since it is larger than the sum of its proper divisors (1).

166066259 is an equidigital number, since it uses as much as digits as its factorization.

166066259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 166066259 is about 12886.6698180717. The cubic root of 166066259 is about 549.6595788723.

The spelling of 166066259 in words is "one hundred sixty-six million, sixty-six thousand, two hundred fifty-nine".