19718207808 has 224 divisors, whose sum is σ = 57468942720. Its totient is φ = 5929697280.

The previous prime is 19718207783. The next prime is 19718207863. The reversal of 19718207808 is 80870281791.

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 31 ways as a sum of consecutive naturals, for example, 37846588 + ... + 37847108.

It is an arithmetic number, because the mean of its divisors is an integer number (256557780).

Almost surely, 2^19718207808 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 19718207808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28734471360).

19718207808 is an abundant number, since it is smaller than the sum of its proper divisors (37750734912).

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

19718207808 is a wasteful number, since it uses less digits than its factorization.

19718207808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 19718207808 in words is "nineteen billion, seven hundred eighteen million, two hundred seven thousand, eight hundred eight".