16738867305521 has 2 divisors, whose sum is σ = 16738867305522. Its totient is φ = 16738867305520.

The previous prime is 16738867305509. The next prime is 16738867305683. The reversal of 16738867305521 is 12550376883761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15863452581025 + 875414724496 = 3982895^2 + 935636^2 .

It is an emirp because it is prime and its reverse (12550376883761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16738867305521 is a prime.

It is not a weakly prime, because it can be changed into another prime (16738867805521) 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, 8369433652760 + 8369433652761.

It is an arithmetic number, because the mean of its divisors is an integer number (8369433652761).

Almost surely, 2^{16738867305521} is an apocalyptic number.

It is an amenable number.

16738867305521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16738867305521 is an equidigital number, since it uses as much as digits as its factorization.

16738867305521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50803200, while the sum is 62.

The spelling of 16738867305521 in words is "sixteen trillion, seven hundred thirty-eight billion, eight hundred sixty-seven million, three hundred five thousand, five hundred twenty-one".