19954443312 has 100 divisors (see below), whose sum is σ = 57783614856. Its totient is φ = 6648065280.

The previous prime is 19954443307. The next prime is 19954443361. The reversal of 19954443312 is 21334445991.

19954443312 is a `hidden beast` number, since 1 + 99 + 544 + 4 + 3 + 3 + 12 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4491012 + ... + 4495452.

Almost surely, 2^19954443312 is an apocalyptic number.

19954443312 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 19954443312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28891807428).

19954443312 is an abundant number, since it is smaller than the sum of its proper divisors (37829171544).

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

19954443312 is a wasteful number, since it uses less digits than its factorization.

19954443312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7928 (or 7913 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 19954443312 in words is "nineteen billion, nine hundred fifty-four million, four hundred forty-three thousand, three hundred twelve".