19991278296 has 288 divisors, whose sum is σ = 62536546800. Its totient is φ = 5756889600.

The previous prime is 19991278283. The next prime is 19991278313. The reversal of 19991278296 is 69287219991.

19991278296 is a `hidden beast` number, since 199 + 91 + 2 + 78 + 296 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16926826 + ... + 16928006.

Almost surely, 2^19991278296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19991278296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31268273400).

19991278296 is an abundant number, since it is smaller than the sum of its proper divisors (42545268504).

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

19991278296 is a wasteful number, since it uses less digits than its factorization.

19991278296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1293 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The spelling of 19991278296 in words is "nineteen billion, nine hundred ninety-one million, two hundred seventy-eight thousand, two hundred ninety-six".