66224789 has 2 divisors, whose sum is σ = 66224790. Its totient is φ = 66224788.

The previous prime is 66224779. The next prime is 66224801. The reversal of 66224789 is 98742266.

66224789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 18130564 = 6935^2 + 4258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66224789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66224729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33112394 + 33112395.

It is an arithmetic number, because the mean of its divisors is an integer number (33112395).

Almost surely, 2^66224789 is an apocalyptic number.

It is an amenable number.

66224789 is a deficient number, since it is larger than the sum of its proper divisors (1).

66224789 is an equidigital number, since it uses as much as digits as its factorization.

66224789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 66224789 is about 8137.8614512659. The cubic root of 66224789 is about 404.5822833327.

It can be divided in two parts, 6622 and 4789, that added together give a palindrome (11411).

The spelling of 66224789 in words is "sixty-six million, two hundred twenty-four thousand, seven hundred eighty-nine".