66072449609 has 2 divisors, whose sum is σ = 66072449610. Its totient is φ = 66072449608.

The previous prime is 66072449581. The next prime is 66072449659. The reversal of 66072449609 is 90694427066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40299358009 + 25773091600 = 200747^2 + 160540^2 .

It is a cyclic number.

It is not a de Polignac number, because 66072449609 - 2¹² = 66072445513 is a prime.

It is not a weakly prime, because it can be changed into another prime (66072449659) 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, 33036224804 + 33036224805.

It is an arithmetic number, because the mean of its divisors is an integer number (33036224805).

Almost surely, 2^66072449609 is an apocalyptic number.

It is an amenable number.

66072449609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66072449609 is an equidigital number, since it uses as much as digits as its factorization.

66072449609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 66072449609 in words is "sixty-six billion, seventy-two million, four hundred forty-nine thousand, six hundred nine".