19961289168 has 40 divisors (see below), whose sum is σ = 51908183616. Its totient is φ = 6609696000.

The previous prime is 19961289149. The next prime is 19961289203. The reversal of 19961289168 is 86198216991.

It is a congruent number.

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, 1369773 + ... + 1384268.

Almost surely, 2^19961289168 is an apocalyptic number.

It is an amenable number.

19961289168 is an abundant number, since it is smaller than the sum of its proper divisors (31946894448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19961289168 is a wasteful number, since it uses less digits than its factorization.

19961289168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754203 (or 2754197 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 60.

The spelling of 19961289168 in words is "nineteen billion, nine hundred sixty-one million, two hundred eighty-nine thousand, one hundred sixty-eight".