64644303329 has 2 divisors, whose sum is σ = 64644303330. Its totient is φ = 64644303328.

The previous prime is 64644303293. The next prime is 64644303341. The reversal of 64644303329 is 92330344646.

64644303329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (64644303293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62526002704 + 2118300625 = 250052^2 + 46025^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644303329 - 2¹² = 64644299233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64644303329.

It is not a weakly prime, because it can be changed into another prime (64644303389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322151664 + 32322151665.

It is an arithmetic number, because the mean of its divisors is an integer number (32322151665).

Almost surely, 2^64644303329 is an apocalyptic number.

It is an amenable number.

64644303329 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644303329 is an equidigital number, since it uses as much as digits as its factorization.

64644303329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 44.

The spelling of 64644303329 in words is "sixty-four billion, six hundred forty-four million, three hundred three thousand, three hundred twenty-nine".