65644223 has 2 divisors, whose sum is σ = 65644224. Its totient is φ = 65644222.

The previous prime is 65644211. The next prime is 65644283. The reversal of 65644223 is 32244656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65644223 - 2⁴ = 65644207 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65644223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65644283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32822111 + 32822112.

It is an arithmetic number, because the mean of its divisors is an integer number (32822112).

Almost surely, 2^65644223 is an apocalyptic number.

65644223 is a deficient number, since it is larger than the sum of its proper divisors (1).

65644223 is an equidigital number, since it uses as much as digits as its factorization.

65644223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 32.

The square root of 65644223 is about 8102.1122554554. The cubic root of 65644223 is about 403.3965417106.

Adding to 65644223 its reverse (32244656), we get a palindrome (97888879).

The spelling of 65644223 in words is "sixty-five million, six hundred forty-four thousand, two hundred twenty-three".