16823956642517 has 2 divisors, whose sum is σ = 16823956642518. Its totient is φ = 16823956642516.

The previous prime is 16823956642513. The next prime is 16823956642531. The reversal of 16823956642517 is 71524665932861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10353007676881 + 6470948965636 = 3217609^2 + 2543806^2 .

It is an emirp because it is prime and its reverse (71524665932861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16823956642517 - 2² = 16823956642513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16823956642513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8411978321258 + 8411978321259.

It is an arithmetic number, because the mean of its divisors is an integer number (8411978321259).

Almost surely, 2^{16823956642517} is an apocalyptic number.

It is an amenable number.

16823956642517 is a deficient number, since it is larger than the sum of its proper divisors (1).

16823956642517 is an equidigital number, since it uses as much as digits as its factorization.

16823956642517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130636800, while the sum is 65.

The spelling of 16823956642517 in words is "sixteen trillion, eight hundred twenty-three billion, nine hundred fifty-six million, six hundred forty-two thousand, five hundred seventeen".