19689443258 has 4 divisors (see below), whose sum is σ = 29534164890. Its totient is φ = 9844721628.

The previous prime is 19689443219. The next prime is 19689443281. The reversal of 19689443258 is 85234498691.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 19338517969 + 350925289 = 139063^2 + 18733^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19689443197 and 19689443206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4922360813 + ... + 4922360816.

Almost surely, 2^19689443258 is an apocalyptic number.

19689443258 is a deficient number, since it is larger than the sum of its proper divisors (9844721632).

19689443258 is an equidigital number, since it uses as much as digits as its factorization.

19689443258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9844721631.

The product of its digits is 14929920, while the sum is 59.

The spelling of 19689443258 in words is "nineteen billion, six hundred eighty-nine million, four hundred forty-three thousand, two hundred fifty-eight".