16421767066559 has 2 divisors, whose sum is σ = 16421767066560. Its totient is φ = 16421767066558.

The previous prime is 16421767066517. The next prime is 16421767066571. The reversal of 16421767066559 is 95566076712461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421767066559 is a prime.

It is a super-2 number, since 2×16421767066559² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16421767066495 and 16421767066504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16421767066589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210883533279 + 8210883533280.

It is an arithmetic number, because the mean of its divisors is an integer number (8210883533280).

Almost surely, 2^{16421767066559} is an apocalyptic number.

16421767066559 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421767066559 is an equidigital number, since it uses as much as digits as its factorization.

16421767066559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 114307200, while the sum is 65.

The spelling of 16421767066559 in words is "sixteen trillion, four hundred twenty-one billion, seven hundred sixty-seven million, sixty-six thousand, five hundred fifty-nine".