19443466909 has 2 divisors, whose sum is σ = 19443466910. Its totient is φ = 19443466908.

The previous prime is 19443466843. The next prime is 19443466919. The reversal of 19443466909 is 90966434491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19397525625 + 45941284 = 139275^2 + 6778^2 .

It is a cyclic number.

It is not a de Polignac number, because 19443466909 - 2⁷ = 19443466781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19443466909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19443466919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9721733454 + 9721733455.

It is an arithmetic number, because the mean of its divisors is an integer number (9721733455).

Almost surely, 2^19443466909 is an apocalyptic number.

It is an amenable number.

19443466909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19443466909 is an equidigital number, since it uses as much as digits as its factorization.

19443466909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 55.

The spelling of 19443466909 in words is "nineteen billion, four hundred forty-three million, four hundred sixty-six thousand, nine hundred nine".