16321730640 has 320 divisors, whose sum is σ = 53619425280. Its totient is φ = 4101672960.

The previous prime is 16321730629. The next prime is 16321730641. The reversal of 16321730640 is 4603712361.

16321730640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16321730641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68291641 + ... + 68291879.

It is an arithmetic number, because the mean of its divisors is an integer number (167560704).

Almost surely, 2^16321730640 is an apocalyptic number.

16321730640 is a gapful number since it is divisible by the number (10) 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 16321730640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26809712640).

16321730640 is an abundant number, since it is smaller than the sum of its proper divisors (37297694640).

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

16321730640 is a wasteful number, since it uses less digits than its factorization.

16321730640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The spelling of 16321730640 in words is "sixteen billion, three hundred twenty-one million, seven hundred thirty thousand, six hundred forty".