19665464563 has 2 divisors, whose sum is σ = 19665464564. Its totient is φ = 19665464562.

The previous prime is 19665464551. The next prime is 19665464701. The reversal of 19665464563 is 36546456691.

It is a weak prime.

It is an emirp because it is prime and its reverse (36546456691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19665464563 - 2²⁹ = 19128593651 is a prime.

It is not a weakly prime, because it can be changed into another prime (19665464363) 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, 9832732281 + 9832732282.

It is an arithmetic number, because the mean of its divisors is an integer number (9832732282).

Almost surely, 2^19665464563 is an apocalyptic number.

19665464563 is a deficient number, since it is larger than the sum of its proper divisors (1).

19665464563 is an equidigital number, since it uses as much as digits as its factorization.

19665464563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13996800, while the sum is 55.

The spelling of 19665464563 in words is "nineteen billion, six hundred sixty-five million, four hundred sixty-four thousand, five hundred sixty-three".