16889543676721 has 3 divisors (see below), whose sum is σ = 16889547786411. Its totient is φ = 16889539567032.

The previous prime is 16889543676667. The next prime is 16889543676727. The reversal of 16889543676721 is 12767634598861.

The square root of 16889543676721 is 4109689.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10056756795121 + 6832786881600 = 3171239^2 + 2613960^2 .

It is not a de Polignac number, because 16889543676721 - 2¹¹ = 16889543674673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16889543676727) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2054845 + ... + 6164533.

It is an arithmetic number, because the mean of its divisors is an integer number (5629849262137).

Almost surely, 2^{16889543676721} is an apocalyptic number.

16889543676721 is the 4109689-th square number.

16889543676721 is the 2054845-th centered octagonal number.

It is an amenable number.

16889543676721 is a deficient number, since it is larger than the sum of its proper divisors (4109690).

16889543676721 is an frugal number, since it uses more digits than its factorization.

16889543676721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8219378 (or 4109689 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 73.

The spelling of 16889543676721 in words is "sixteen trillion, eight hundred eighty-nine billion, five hundred forty-three million, six hundred seventy-six thousand, seven hundred twenty-one".