166161241 has 2 divisors, whose sum is σ = 166161242. Its totient is φ = 166161240.

The previous prime is 166161239. The next prime is 166161257. The reversal of 166161241 is 142161661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122323600 + 43837641 = 11060^2 + 6621^2 .

It is a cyclic number.

It is not a de Polignac number, because 166161241 - 2¹ = 166161239 is a prime.

Together with 166161239, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166161221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83080620 + 83080621.

It is an arithmetic number, because the mean of its divisors is an integer number (83080621).

Almost surely, 2^166161241 is an apocalyptic number.

It is an amenable number.

166161241 is a deficient number, since it is larger than the sum of its proper divisors (1).

166161241 is an equidigital number, since it uses as much as digits as its factorization.

166161241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 166161241 is about 12890.3545723149. The cubic root of 166161241 is about 549.7643519433.

The spelling of 166161241 in words is "one hundred sixty-six million, one hundred sixty-one thousand, two hundred forty-one".