43665805489 has 2 divisors, whose sum is σ = 43665805490. Its totient is φ = 43665805488.

The previous prime is 43665805457. The next prime is 43665805511. The reversal of 43665805489 is 98450856634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40877965489 + 2787840000 = 202183^2 + 52800^2 .

It is a cyclic number.

It is not a de Polignac number, because 43665805489 - 2⁵ = 43665805457 is a prime.

It is not a weakly prime, because it can be changed into another prime (43665808489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21832902744 + 21832902745.

It is an arithmetic number, because the mean of its divisors is an integer number (21832902745).

Almost surely, 2^43665805489 is an apocalyptic number.

It is an amenable number.

43665805489 is a deficient number, since it is larger than the sum of its proper divisors (1).

43665805489 is an equidigital number, since it uses as much as digits as its factorization.

43665805489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24883200, while the sum is 58.

The spelling of 43665805489 in words is "forty-three billion, six hundred sixty-five million, eight hundred five thousand, four hundred eighty-nine".