17821848857317 has 2 divisors, whose sum is σ = 17821848857318. Its totient is φ = 17821848857316.

The previous prime is 17821848857287. The next prime is 17821848857363. The reversal of 17821848857317 is 71375884812871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15403945145796 + 2417903711521 = 3924786^2 + 1554961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17821848857317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17821848857117) 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, 8910924428658 + 8910924428659.

It is an arithmetic number, because the mean of its divisors is an integer number (8910924428659).

Almost surely, 2^{17821848857317} is an apocalyptic number.

It is an amenable number.

17821848857317 is a deficient number, since it is larger than the sum of its proper divisors (1).

17821848857317 is an equidigital number, since it uses as much as digits as its factorization.

17821848857317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168591360, while the sum is 70.

The spelling of 17821848857317 in words is "seventeen trillion, eight hundred twenty-one billion, eight hundred forty-eight million, eight hundred fifty-seven thousand, three hundred seventeen".