66675449 has 2 divisors, whose sum is σ = 66675450. Its totient is φ = 66675448.

The previous prime is 66675421. The next prime is 66675481. The reversal of 66675449 is 94457666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 32569849 = 5840^2 + 5707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66675449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66675949) 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, 33337724 + 33337725.

It is an arithmetic number, because the mean of its divisors is an integer number (33337725).

Almost surely, 2^66675449 is an apocalyptic number.

It is an amenable number.

66675449 is a deficient number, since it is larger than the sum of its proper divisors (1).

66675449 is an equidigital number, since it uses as much as digits as its factorization.

66675449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The square root of 66675449 is about 8165.5035974519. The cubic root of 66675449 is about 405.4979375649.

The spelling of 66675449 in words is "sixty-six million, six hundred seventy-five thousand, four hundred forty-nine".