64444716847409 has 2 divisors, whose sum is σ = 64444716847410. Its totient is φ = 64444716847408.

The previous prime is 64444716847393. The next prime is 64444716847447. The reversal of 64444716847409 is 90474861744446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59257710597409 + 5187006250000 = 7697903^2 + 2277500^2 .

It is a cyclic number.

It is not a de Polignac number, because 64444716847409 - 2⁴ = 64444716847393 is a prime.

It is not a weakly prime, because it can be changed into another prime (64444716867409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222358423704 + 32222358423705.

It is an arithmetic number, because the mean of its divisors is an integer number (32222358423705).

Almost surely, 2^{64444716847409} is an apocalyptic number.

It is an amenable number.

64444716847409 is a deficient number, since it is larger than the sum of its proper divisors (1).

64444716847409 is an equidigital number, since it uses as much as digits as its factorization.

64444716847409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 520224768, while the sum is 68.

The spelling of 64444716847409 in words is "sixty-four trillion, four hundred forty-four billion, seven hundred sixteen million, eight hundred forty-seven thousand, four hundred nine".