16669421775361 has 2 divisors, whose sum is σ = 16669421775362. Its totient is φ = 16669421775360.

The previous prime is 16669421775359. The next prime is 16669421775397. The reversal of 16669421775361 is 16357712496661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14938657883136 + 1730763892225 = 3865056^2 + 1315585^2 .

It is a cyclic number.

It is not a de Polignac number, because 16669421775361 - 2¹ = 16669421775359 is a prime.

Together with 16669421775359, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 16669421775293 and 16669421775302.

It is not a weakly prime, because it can be changed into another prime (16669421725361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334710887680 + 8334710887681.

It is an arithmetic number, because the mean of its divisors is an integer number (8334710887681).

Almost surely, 2^{16669421775361} is an apocalyptic number.

It is an amenable number.

16669421775361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16669421775361 is an equidigital number, since it uses as much as digits as its factorization.

16669421775361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 64.

The spelling of 16669421775361 in words is "sixteen trillion, six hundred sixty-nine billion, four hundred twenty-one million, seven hundred seventy-five thousand, three hundred sixty-one".