666352241 has 2 divisors, whose sum is σ = 666352242. Its totient is φ = 666352240.

The previous prime is 666352201. The next prime is 666352243. The reversal of 666352241 is 142253666.

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., 625200016 + 41152225 = 25004^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 666352241 - 2⁶ = 666352177 is a prime.

Together with 666352243, 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 (666352243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333176120 + 333176121.

It is an arithmetic number, because the mean of its divisors is an integer number (333176121).

Almost surely, 2^666352241 is an apocalyptic number.

It is an amenable number.

666352241 is a deficient number, since it is larger than the sum of its proper divisors (1).

666352241 is an equidigital number, since it uses as much as digits as its factorization.

666352241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 35.

The square root of 666352241 is about 25813.7994297624. The cubic root of 666352241 is about 873.4431050793.

The spelling of 666352241 in words is "six hundred sixty-six million, three hundred fifty-two thousand, two hundred forty-one".