16551115250321 has 8 divisors (see below), whose sum is σ = 16764587082984. Its totient is φ = 16338615955200.

The previous prime is 16551115250311. The next prime is 16551115250357. The reversal of 16551115250321 is 12305251115561.

16551115250321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 917505358225 + 15633609892096 = 957865^2 + 3953936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16551115250321 - 2¹⁰ = 16551115249297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16551115250311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243100130 + ... + 243168203.

It is an arithmetic number, because the mean of its divisors is an integer number (2095573385373).

Almost surely, 2^{16551115250321} is an apocalyptic number.

It is an amenable number.

16551115250321 is a deficient number, since it is larger than the sum of its proper divisors (213471832663).

16551115250321 is a wasteful number, since it uses less digits than its factorization.

16551115250321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486268771.

The product of its (nonzero) digits is 45000, while the sum is 38.

Adding to 16551115250321 its reverse (12305251115561), we get a palindrome (28856366365882).

The spelling of 16551115250321 in words is "sixteen trillion, five hundred fifty-one billion, one hundred fifteen million, two hundred fifty thousand, three hundred twenty-one".