66443449 has 2 divisors, whose sum is σ = 66443450. Its totient is φ = 66443448.

The previous prime is 66443441. The next prime is 66443467. The reversal of 66443449 is 94434466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58798224 + 7645225 = 7668^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 66443449 - 2³ = 66443441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66443441) 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, 33221724 + 33221725.

It is an arithmetic number, because the mean of its divisors is an integer number (33221725).

Almost surely, 2^66443449 is an apocalyptic number.

It is an amenable number.

66443449 is a deficient number, since it is larger than the sum of its proper divisors (1).

66443449 is an equidigital number, since it uses as much as digits as its factorization.

66443449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 40.

The square root of 66443449 is about 8151.2851134039. The cubic root of 66443449 is about 405.0270753631.

The spelling of 66443449 in words is "sixty-six million, four hundred forty-three thousand, four hundred forty-nine".