19889543458 has 16 divisors (see below), whose sum is σ = 29888563320. Its totient is φ = 9926706816.

The previous prime is 19889543449. The next prime is 19889543461. The reversal of 19889543458 is 85434598891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9192399129 + 10697144329 = 95877^2 + 103427^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19889543458.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3169548 + ... + 3175816.

Almost surely, 2^19889543458 is an apocalyptic number.

19889543458 is a deficient number, since it is larger than the sum of its proper divisors (9999019862).

19889543458 is a wasteful number, since it uses less digits than its factorization.

19889543458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8901.

The product of its digits is 49766400, while the sum is 64.

The spelling of 19889543458 in words is "nineteen billion, eight hundred eighty-nine million, five hundred forty-three thousand, four hundred fifty-eight".