19889509718 has 32 divisors (see below), whose sum is σ = 32633055840. Its totient is φ = 9036023040.

The previous prime is 19889509709. The next prime is 19889509723. The reversal of 19889509718 is 81790598891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2903978 + ... + 2910818.

It is an arithmetic number, because the mean of its divisors is an integer number (1019782995).

Almost surely, 2^19889509718 is an apocalyptic number.

19889509718 is a deficient number, since it is larger than the sum of its proper divisors (12743546122).

19889509718 is a wasteful number, since it uses less digits than its factorization.

19889509718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8592.

The product of its (nonzero) digits is 13063680, while the sum is 65.

The spelling of 19889509718 in words is "nineteen billion, eight hundred eighty-nine million, five hundred nine thousand, seven hundred eighteen".