666542033 has 2 divisors, whose sum is σ = 666542034. Its totient is φ = 666542032.

The previous prime is 666541987. The next prime is 666542077. The reversal of 666542033 is 330245666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509991889 + 156550144 = 22583^2 + 12512^2 .

It is a cyclic number.

It is not a de Polignac number, because 666542033 - 2¹⁴ = 666525649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666541984 and 666542002.

It is not a weakly prime, because it can be changed into another prime (666542333) 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, 333271016 + 333271017.

It is an arithmetic number, because the mean of its divisors is an integer number (333271017).

Almost surely, 2^666542033 is an apocalyptic number.

It is an amenable number.

666542033 is a deficient number, since it is larger than the sum of its proper divisors (1).

666542033 is an equidigital number, since it uses as much as digits as its factorization.

666542033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 666542033 is about 25817.4753413265. The cubic root of 666542033 is about 873.5260225753.

Adding to 666542033 its reverse (330245666), we get a palindrome (996787699).

The spelling of 666542033 in words is "six hundred sixty-six million, five hundred forty-two thousand, thirty-three".