16443602022581 has 2 divisors, whose sum is σ = 16443602022582. Its totient is φ = 16443602022580.

The previous prime is 16443602022521. The next prime is 16443602022643. The reversal of 16443602022581 is 18522020634461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12198184908100 + 4245417114481 = 3492590^2 + 2060441^2 .

It is a cyclic number.

It is not a de Polignac number, because 16443602022581 - 2¹⁴ = 16443602006197 is a prime.

It is a super-3 number, since 3×16443602022581³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16443602022521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221801011290 + 8221801011291.

It is an arithmetic number, because the mean of its divisors is an integer number (8221801011291).

Almost surely, 2^{16443602022581} is an apocalyptic number.

It is an amenable number.

16443602022581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16443602022581 is an equidigital number, since it uses as much as digits as its factorization.

16443602022581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 16443602022581 in words is "sixteen trillion, four hundred forty-three billion, six hundred two million, twenty-two thousand, five hundred eighty-one".