65666149 has 2 divisors, whose sum is σ = 65666150. Its totient is φ = 65666148.

The previous prime is 65666131. The next prime is 65666171. The reversal of 65666149 is 94166656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59954049 + 5712100 = 7743^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 65666149 - 2⁷ = 65666021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65616149) 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, 32833074 + 32833075.

It is an arithmetic number, because the mean of its divisors is an integer number (32833075).

Almost surely, 2^65666149 is an apocalyptic number.

It is an amenable number.

65666149 is a deficient number, since it is larger than the sum of its proper divisors (1).

65666149 is an equidigital number, since it uses as much as digits as its factorization.

65666149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 65666149 is about 8103.4652464239. The cubic root of 65666149 is about 403.4414498919.

The spelling of 65666149 in words is "sixty-five million, six hundred sixty-six thousand, one hundred forty-nine".