666306241 has 2 divisors, whose sum is σ = 666306242. Its totient is φ = 666306240.

The previous prime is 666306239. The next prime is 666306247. The reversal of 666306241 is 142603666.

666306241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662290225 + 4016016 = 25735^2 + 2004^2 .

It is a cyclic number.

It is not a de Polignac number, because 666306241 - 2¹ = 666306239 is a prime.

Together with 666306239, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 666306197 and 666306206.

It is not a weakly prime, because it can be changed into another prime (666306247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333153120 + 333153121.

It is an arithmetic number, because the mean of its divisors is an integer number (333153121).

Almost surely, 2^666306241 is an apocalyptic number.

It is an amenable number.

666306241 is a deficient number, since it is larger than the sum of its proper divisors (1).

666306241 is an equidigital number, since it uses as much as digits as its factorization.

666306241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 666306241 is about 25812.9084180764. The cubic root of 666306241 is about 873.4230059461.

The spelling of 666306241 in words is "six hundred sixty-six million, three hundred six thousand, two hundred forty-one".