16321955521936 has 75 divisors (see below), whose sum is σ = 32709035771115. Its totient is φ = 7890205932000.

The previous prime is 16321955521933. The next prime is 16321955521961. The reversal of 16321955521936 is 63912555912361.

It is a happy number.

The square root of 16321955521936 is 4040044.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (16321955521933) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 15529928611 + ... + 15529929661.

Almost surely, 2^{16321955521936} is an apocalyptic number.

16321955521936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

16321955521936 is the 4040044-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16321955521936

16321955521936 is an abundant number, since it is smaller than the sum of its proper divisors (16387080249179).

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

16321955521936 is an frugal number, since it uses more digits than its factorization.

16321955521936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234 (or 1084 counting only the distinct ones).

The product of its digits is 13122000, while the sum is 58.

The spelling of 16321955521936 in words is "sixteen trillion, three hundred twenty-one billion, nine hundred fifty-five million, five hundred twenty-one thousand, nine hundred thirty-six".