16321703396544 has 336 divisors, whose sum is σ = 57729751252992. Its totient is φ = 4293380560896.

The previous prime is 16321703396539. The next prime is 16321703396707. The reversal of 16321703396544 is 44569330712361.

16321703396544 is a `hidden beast` number, since 1 + 6 + 3 + 2 + 1 + 7 + 0 + 3 + 3 + 96 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×16321703396544² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19668817 + ... + 20481839.

It is an arithmetic number, because the mean of its divisors is an integer number (171814735872).

Almost surely, 2^{16321703396544} is an apocalyptic number.

16321703396544 is a gapful number since it is divisible by the number (14) 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 16321703396544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28864875626496).

16321703396544 is an abundant number, since it is smaller than the sum of its proper divisors (41408047856448).

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

16321703396544 is a wasteful number, since it uses less digits than its factorization.

16321703396544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813444 (or 813431 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

The spelling of 16321703396544 in words is "sixteen trillion, three hundred twenty-one billion, seven hundred three million, three hundred ninety-six thousand, five hundred forty-four".