66884548609 has 2 divisors, whose sum is σ = 66884548610. Its totient is φ = 66884548608.

The previous prime is 66884548597. The next prime is 66884548637. The reversal of 66884548609 is 90684548866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51227532225 + 15657016384 = 226335^2 + 125128^2 .

It is a cyclic number.

It is not a de Polignac number, because 66884548609 - 2³¹ = 64737064961 is a prime.

It is not a weakly prime, because it can be changed into another prime (66884548649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33442274304 + 33442274305.

It is an arithmetic number, because the mean of its divisors is an integer number (33442274305).

Almost surely, 2^66884548609 is an apocalyptic number.

It is an amenable number.

66884548609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66884548609 is an equidigital number, since it uses as much as digits as its factorization.

66884548609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79626240, while the sum is 64.

The spelling of 66884548609 in words is "sixty-six billion, eight hundred eighty-four million, five hundred forty-eight thousand, six hundred nine".