166942291 has 2 divisors, whose sum is σ = 166942292. Its totient is φ = 166942290.

The previous prime is 166942289. The next prime is 166942327. The reversal of 166942291 is 192249661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166942291 - 2¹ = 166942289 is a prime.

Together with 166942289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166942271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83471145 + 83471146.

It is an arithmetic number, because the mean of its divisors is an integer number (83471146).

Almost surely, 2^166942291 is an apocalyptic number.

166942291 is a deficient number, since it is larger than the sum of its proper divisors (1).

166942291 is an equidigital number, since it uses as much as digits as its factorization.

166942291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 166942291 is about 12920.6149621448. The cubic root of 166942291 is about 550.6244049059.

The spelling of 166942291 in words is "one hundred sixty-six million, nine hundred forty-two thousand, two hundred ninety-one".