166042361 has 2 divisors, whose sum is σ = 166042362. Its totient is φ = 166042360.

The previous prime is 166042351. The next prime is 166042367. The reversal of 166042361 is 163240661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165276736 + 765625 = 12856^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 166042361 - 2⁶ = 166042297 is a prime.

It is a super-3 number, since 3×166042361³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166042367) 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, 83021180 + 83021181.

It is an arithmetic number, because the mean of its divisors is an integer number (83021181).

Almost surely, 2^166042361 is an apocalyptic number.

It is an amenable number.

166042361 is a deficient number, since it is larger than the sum of its proper divisors (1).

166042361 is an equidigital number, since it uses as much as digits as its factorization.

166042361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 166042361 is about 12885.7425474825. The cubic root of 166042361 is about 549.6332110943.

The spelling of 166042361 in words is "one hundred sixty-six million, forty-two thousand, three hundred sixty-one".