16488766244221 has 2 divisors, whose sum is σ = 16488766244222. Its totient is φ = 16488766244220.

The previous prime is 16488766244149. The next prime is 16488766244273. The reversal of 16488766244221 is 12244266788461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15397815240025 + 1090951004196 = 3924005^2 + 1044486^2 .

It is a cyclic number.

It is not a de Polignac number, because 16488766244221 - 2¹¹ = 16488766242173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16488766244221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16488766224221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8244383122110 + 8244383122111.

It is an arithmetic number, because the mean of its divisors is an integer number (8244383122111).

Almost surely, 2^{16488766244221} is an apocalyptic number.

It is an amenable number.

16488766244221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16488766244221 is an equidigital number, since it uses as much as digits as its factorization.

16488766244221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49545216, while the sum is 61.

The spelling of 16488766244221 in words is "sixteen trillion, four hundred eighty-eight billion, seven hundred sixty-six million, two hundred forty-four thousand, two hundred twenty-one".