64644303253 has 2 divisors, whose sum is σ = 64644303254. Its totient is φ = 64644303252.

The previous prime is 64644303239. The next prime is 64644303257. The reversal of 64644303253 is 35230344646.

It is a happy number.

64644303253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57788794449 + 6855508804 = 240393^2 + 82798^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644303253 - 2¹⁷ = 64644172181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64644303257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322151626 + 32322151627.

It is an arithmetic number, because the mean of its divisors is an integer number (32322151627).

Almost surely, 2^64644303253 is an apocalyptic number.

It is an amenable number.

64644303253 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644303253 is an equidigital number, since it uses as much as digits as its factorization.

64644303253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 40.

Adding to 64644303253 its reverse (35230344646), we get a palindrome (99874647899).

The spelling of 64644303253 in words is "sixty-four billion, six hundred forty-four million, three hundred three thousand, two hundred fifty-three".