16947559666447 has 2 divisors, whose sum is σ = 16947559666448. Its totient is φ = 16947559666446.

The previous prime is 16947559666421. The next prime is 16947559666489. The reversal of 16947559666447 is 74466695574961.

It is a weak prime.

It is an emirp because it is prime and its reverse (74466695574961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16947559666447 is a prime.

It is a super-2 number, since 2×16947559666447² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16947559666847) 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, 8473779833223 + 8473779833224.

It is an arithmetic number, because the mean of its divisors is an integer number (8473779833224).

Almost surely, 2^{16947559666447} is an apocalyptic number.

16947559666447 is a deficient number, since it is larger than the sum of its proper divisors (1).

16947559666447 is an equidigital number, since it uses as much as digits as its factorization.

16947559666447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8230118400, while the sum is 79.

The spelling of 16947559666447 in words is "sixteen trillion, nine hundred forty-seven billion, five hundred fifty-nine million, six hundred sixty-six thousand, four hundred forty-seven".