19999181312 has 80 divisors (see below), whose sum is σ = 44520043392. Its totient is φ = 8897003520.

The previous prime is 19999181309. The next prime is 19999181369. The reversal of 19999181312 is 21318199991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226928 + ... + 302480.

Almost surely, 2^19999181312 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 19999181312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22260021696).

19999181312 is an abundant number, since it is smaller than the sum of its proper divisors (24520862080).

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

19999181312 is an equidigital number, since it uses as much as digits as its factorization.

19999181312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75629 (or 75613 counting only the distinct ones).

The product of its digits is 314928, while the sum is 53.

The spelling of 19999181312 in words is "nineteen billion, nine hundred ninety-nine million, one hundred eighty-one thousand, three hundred twelve".