16443537224981 has 2 divisors, whose sum is σ = 16443537224982. Its totient is φ = 16443537224980.

The previous prime is 16443537224969. The next prime is 16443537225041. The reversal of 16443537224981 is 18942273534461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11497321192900 + 4946216032081 = 3390770^2 + 2224009^2 .

It is a cyclic number.

It is not a de Polignac number, because 16443537224981 - 2¹⁴ = 16443537208597 is a prime.

It is a super-3 number, since 3×16443537224981³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 16443537224981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16443537224581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221768612490 + 8221768612491.

It is an arithmetic number, because the mean of its divisors is an integer number (8221768612491).

Almost surely, 2^{16443537224981} is an apocalyptic number.

It is an amenable number.

16443537224981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16443537224981 is an equidigital number, since it uses as much as digits as its factorization.

16443537224981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 59.

The spelling of 16443537224981 in words is "sixteen trillion, four hundred forty-three billion, five hundred thirty-seven million, two hundred twenty-four thousand, nine hundred eighty-one".