19981500336 has 160 divisors (see below), whose sum is σ = 66378291200. Its totient is φ = 5636666880.

The previous prime is 19981500317. The next prime is 19981500379. The reversal of 19981500336 is 63300518991.

19981500336 is a `hidden beast` number, since 199 + 81 + 50 + 0 + 336 = 666.

It is a super-2 number, since 2×19981500336² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19981500291 and 19981500300.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197076 + ... + 280716.

It is an arithmetic number, because the mean of its divisors is an integer number (414864320).

Almost surely, 2^19981500336 is an apocalyptic number.

19981500336 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 19981500336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33189145600).

19981500336 is an abundant number, since it is smaller than the sum of its proper divisors (46396790864).

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

19981500336 is a wasteful number, since it uses less digits than its factorization.

19981500336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83744 (or 83732 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 19981500336 in words is "nineteen billion, nine hundred eighty-one million, five hundred thousand, three hundred thirty-six".