1817822648393 has 2 divisors, whose sum is σ = 1817822648394. Its totient is φ = 1817822648392.

The previous prime is 1817822648359. The next prime is 1817822648419. The reversal of 1817822648393 is 3938462287181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1346453895424 + 471368752969 = 1160368^2 + 686563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1817822648393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1817822648293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908911324196 + 908911324197.

It is an arithmetic number, because the mean of its divisors is an integer number (908911324197).

Almost surely, 2^{1817822648393} is an apocalyptic number.

It is an amenable number.

1817822648393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817822648393 is an equidigital number, since it uses as much as digits as its factorization.

1817822648393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 62.

The spelling of 1817822648393 in words is "one trillion, eight hundred seventeen billion, eight hundred twenty-two million, six hundred forty-eight thousand, three hundred ninety-three".