666242033 has 2 divisors, whose sum is σ = 666242034. Its totient is φ = 666242032.

The previous prime is 666242021. The next prime is 666242051. The reversal of 666242033 is 330242666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508186849 + 158055184 = 22543^2 + 12572^2 .

It is a cyclic number.

It is not a de Polignac number, because 666242033 - 2¹² = 666237937 is a prime.

It is not a weakly prime, because it can be changed into another prime (666242063) 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, 333121016 + 333121017.

It is an arithmetic number, because the mean of its divisors is an integer number (333121017).

Almost surely, 2^666242033 is an apocalyptic number.

It is an amenable number.

666242033 is a deficient number, since it is larger than the sum of its proper divisors (1).

666242033 is an equidigital number, since it uses as much as digits as its factorization.

666242033 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 32.

The square root of 666242033 is about 25811.6646692924. The cubic root of 666242033 is about 873.3949495048.

Adding to 666242033 its reverse (330242666), we get a palindrome (996484699).

The spelling of 666242033 in words is "six hundred sixty-six million, two hundred forty-two thousand, thirty-three".