43447444328681 has 2 divisors, whose sum is σ = 43447444328682. Its totient is φ = 43447444328680.

The previous prime is 43447444328671. The next prime is 43447444328683. The reversal of 43447444328681 is 18682344474434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42833634757081 + 613809571600 = 6544741^2 + 783460^2 .

It is a cyclic number.

It is not a de Polignac number, because 43447444328681 - 2¹⁰ = 43447444327657 is a prime.

It is a super-2 number, since 2×43447444328681² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 43447444328683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43447444328683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21723722164340 + 21723722164341.

It is an arithmetic number, because the mean of its divisors is an integer number (21723722164341).

Almost surely, 2^{43447444328681} is an apocalyptic number.

It is an amenable number.

43447444328681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43447444328681 is an equidigital number, since it uses as much as digits as its factorization.

43447444328681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198180864, while the sum is 62.

The spelling of 43447444328681 in words is "forty-three trillion, four hundred forty-seven billion, four hundred forty-four million, three hundred twenty-eight thousand, six hundred eighty-one".