19998131712 has 160 divisors (see below), whose sum is σ = 60395301120. Its totient is φ = 5829304320.

The previous prime is 19998131711. The next prime is 19998131719. The reversal of 19998131712 is 21713189991.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998131711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353037 + ... + 405747.

It is an arithmetic number, because the mean of its divisors is an integer number (377470632).

Almost surely, 2^19998131712 is an apocalyptic number.

19998131712 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 19998131712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30197650560).

19998131712 is an abundant number, since it is smaller than the sum of its proper divisors (40397169408).

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

19998131712 is a wasteful number, since it uses less digits than its factorization.

19998131712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52764 (or 52748 counting only the distinct ones).

The product of its digits is 244944, while the sum is 51.

The spelling of 19998131712 in words is "nineteen billion, nine hundred ninety-eight million, one hundred thirty-one thousand, seven hundred twelve".