19889974519 has 4 divisors (see below), whose sum is σ = 19946966200. Its totient is φ = 19832982840.

The previous prime is 19889974499. The next prime is 19889974537. The reversal of 19889974519 is 91547998891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19889974519 - 2¹¹ = 19889972471 is a prime.

It is a super-2 number, since 2×19889974519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19889974319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28495317 + ... + 28496014.

It is an arithmetic number, because the mean of its divisors is an integer number (4986741550).

Almost surely, 2^19889974519 is an apocalyptic number.

19889974519 is a deficient number, since it is larger than the sum of its proper divisors (56991681).

19889974519 is an equidigital number, since it uses as much as digits as its factorization.

19889974519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56991680.

The product of its digits is 58786560, while the sum is 70.

The spelling of 19889974519 in words is "nineteen billion, eight hundred eighty-nine million, nine hundred seventy-four thousand, five hundred nineteen".