19811285568 has 168 divisors, whose sum is σ = 58747493376. Its totient is φ = 6376550400.

The previous prime is 19811285531. The next prime is 19811285569. The reversal of 19811285568 is 86558211891.

19811285568 is a `hidden beast` number, since 1 + 9 + 81 + 1 + 2 + 8 + 556 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (19811285569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10587673 + ... + 10589543.

Almost surely, 2^19811285568 is an apocalyptic number.

19811285568 is a gapful number since it is divisible by the number (18) 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 19811285568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29373746688).

19811285568 is an abundant number, since it is smaller than the sum of its proper divisors (38936207808).

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

19811285568 is a wasteful number, since it uses less digits than its factorization.

19811285568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513 (or 2500 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 54.

The spelling of 19811285568 in words is "nineteen billion, eight hundred eleven million, two hundred eighty-five thousand, five hundred sixty-eight".