19999787334912 has 1440 divisors, whose sum is σ = 78615316792320. Its totient is φ = 4919528079360.

The previous prime is 19999787334907. The next prime is 19999787334937. The reversal of 19999787334912 is 21943378799991.

19999787334912 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 97 + 8 + 7 + 33 + 491 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 7371833268 + ... + 7371835980.

Almost surely, 2^{19999787334912} is an apocalyptic number.

19999787334912 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 19999787334912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39307658396160).

19999787334912 is an abundant number, since it is smaller than the sum of its proper divisors (58615529457408).

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

19999787334912 is an frugal number, since it uses more digits than its factorization.

19999787334912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793 (or 2755 counting only the distinct ones).

The product of its digits is 1666598976, while the sum is 81.

The spelling of 19999787334912 in words is "nineteen trillion, nine hundred ninety-nine billion, seven hundred eighty-seven million, three hundred thirty-four thousand, nine hundred twelve".