19997232188448 has 96 divisors (see below), whose sum is σ = 52855212638592. Its totient is φ = 6619739904000.

The previous prime is 19997232188443. The next prime is 19997232188497. The reversal of 19997232188448 is 84488123279991.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 19997232188448.

It is not an unprimeable number, because it can be changed into a prime (19997232188443) 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, 51892158 + ... + 52276098.

It is an arithmetic number, because the mean of its divisors is an integer number (550575131652).

Almost surely, 2^{19997232188448} 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 19997232188448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26427606319296).

19997232188448 is an abundant number, since it is smaller than the sum of its proper divisors (32857980450144).

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

19997232188448 is a wasteful number, since it uses less digits than its factorization.

19997232188448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387698 (or 387690 counting only the distinct ones).

The product of its digits is 501645312, while the sum is 75.

The spelling of 19997232188448 in words is "nineteen trillion, nine hundred ninety-seven billion, two hundred thirty-two million, one hundred eighty-eight thousand, four hundred forty-eight".