66884473 has 2 divisors, whose sum is σ = 66884474. Its totient is φ = 66884472.

The previous prime is 66884459. The next prime is 66884491. The reversal of 66884473 is 37448866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35378704 + 31505769 = 5948^2 + 5613^2 .

It is a cyclic number.

It is not a de Polignac number, because 66884473 - 2²⁵ = 33330041 is a prime.

It is not a weakly prime, because it can be changed into another prime (66884173) 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, 33442236 + 33442237.

It is an arithmetic number, because the mean of its divisors is an integer number (33442237).

Almost surely, 2^66884473 is an apocalyptic number.

It is an amenable number.

66884473 is a deficient number, since it is larger than the sum of its proper divisors (1).

66884473 is an equidigital number, since it uses as much as digits as its factorization.

66884473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 46.

The square root of 66884473 is about 8178.2927925087. The cubic root of 66884473 is about 405.9212337189.

The spelling of 66884473 in words is "sixty-six million, eight hundred eighty-four thousand, four hundred seventy-three".