19859819112 has 160 divisors (see below), whose sum is σ = 65123593920. Its totient is φ = 5535786240.

The previous prime is 19859819069. The next prime is 19859819113. The reversal of 19859819112 is 21191895891.

It is a happy number.

It is a super-2 number, since 2×19859819112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19859819113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 132583 + ... + 239369.

It is an arithmetic number, because the mean of its divisors is an integer number (407022462).

Almost surely, 2^19859819112 is an apocalyptic number.

19859819112 is a gapful number since it is divisible by the number (12) 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 19859819112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32561796960).

19859819112 is an abundant number, since it is smaller than the sum of its proper divisors (45263774808).

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

19859819112 is a wasteful number, since it uses less digits than its factorization.

19859819112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106853 (or 106840 counting only the distinct ones).

The product of its digits is 466560, while the sum is 54.

The spelling of 19859819112 in words is "nineteen billion, eight hundred fifty-nine million, eight hundred nineteen thousand, one hundred twelve".