16321632320015 has 32 divisors (see below), whose sum is σ = 21512078502912. Its totient is φ = 11789431200000.

The previous prime is 16321632319987. The next prime is 16321632320017. The reversal of 16321632320015 is 51002323612361.

It is a happy number.

16321632320015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 4040004²-1.

It is not a de Polignac number, because 16321632320015 - 2¹⁰ = 16321632318991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16321632320017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44256419 + ... + 44623691.

It is an arithmetic number, because the mean of its divisors is an integer number (672252453216).

Almost surely, 2^{16321632320015} is an apocalyptic number.

16321632320015 is a deficient number, since it is larger than the sum of its proper divisors (5190446182897).

16321632320015 is a wasteful number, since it uses less digits than its factorization.

16321632320015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372791.

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 16321632320015 its reverse (51002323612361), we get a palindrome (67323955932376).

The spelling of 16321632320015 in words is "sixteen trillion, three hundred twenty-one billion, six hundred thirty-two million, three hundred twenty thousand, fifteen".