66644323 has 2 divisors, whose sum is σ = 66644324. Its totient is φ = 66644322.

The previous prime is 66644309. The next prime is 66644341. The reversal of 66644323 is 32344666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66644323 - 2¹³ = 66636131 is a prime.

It is not a weakly prime, because it can be changed into another prime (66644353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322161 + 33322162.

It is an arithmetic number, because the mean of its divisors is an integer number (33322162).

Almost surely, 2^66644323 is an apocalyptic number.

66644323 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644323 is an equidigital number, since it uses as much as digits as its factorization.

66644323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 34.

The square root of 66644323 is about 8163.5974300550. The cubic root of 66644323 is about 405.4348284118.

Adding to 66644323 its reverse (32344666), we get a palindrome (98988989).

The spelling of 66644323 in words is "sixty-six million, six hundred forty-four thousand, three hundred twenty-three".