19711320448 has 16 divisors (see below), whose sum is σ = 39268646460. Its totient is φ = 9855660160.

The previous prime is 19711320403. The next prime is 19711320449. The reversal of 19711320448 is 84402311791.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 19711320448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19711320449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76997218 + ... + 76997473.

Almost surely, 2^19711320448 is an apocalyptic number.

It is an amenable number.

19711320448 is a deficient number, since it is larger than the sum of its proper divisors (19557326012).

19711320448 is an equidigital number, since it uses as much as digits as its factorization.

19711320448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153994705 (or 153994693 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 19711320448 in words is "nineteen billion, seven hundred eleven million, three hundred twenty thousand, four hundred forty-eight".