64666222241 has 2 divisors, whose sum is σ = 64666222242. Its totient is φ = 64666222240.

The previous prime is 64666222223. The next prime is 64666222289. The reversal of 64666222241 is 14222266646.

It is a happy number.

64666222241 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., 63370510225 + 1295712016 = 251735^2 + 35996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64666222241 is a prime.

It is not a weakly prime, because it can be changed into another prime (64666212241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32333111120 + 32333111121.

It is an arithmetic number, because the mean of its divisors is an integer number (32333111121).

Almost surely, 2^64666222241 is an apocalyptic number.

It is an amenable number.

64666222241 is a deficient number, since it is larger than the sum of its proper divisors (1).

64666222241 is an equidigital number, since it uses as much as digits as its factorization.

64666222241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 41.

Adding to 64666222241 its reverse (14222266646), we get a palindrome (78888488887).

The spelling of 64666222241 in words is "sixty-four billion, six hundred sixty-six million, two hundred twenty-two thousand, two hundred forty-one".