19808559936 has 448 divisors, whose sum is σ = 68470272000. Its totient is φ = 5548400640.

The previous prime is 19808559917. The next prime is 19808559943. The reversal of 19808559936 is 63995580891.

19808559936 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 8 + 5 + 599 + 36 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19064505 + ... + 19065543.

Almost surely, 2^19808559936 is an apocalyptic number.

19808559936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19808559936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34235136000).

19808559936 is an abundant number, since it is smaller than the sum of its proper divisors (48661712064).

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

19808559936 is a wasteful number, since it uses less digits than its factorization.

19808559936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147 (or 1131 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 63.

The spelling of 19808559936 in words is "nineteen billion, eight hundred eight million, five hundred fifty-nine thousand, nine hundred thirty-six".