1817011816813 has 2 divisors, whose sum is σ = 1817011816814. Its totient is φ = 1817011816812.

The previous prime is 1817011816709. The next prime is 1817011816889. The reversal of 1817011816813 is 3186181107181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1754877779524 + 62134037289 = 1324718^2 + 249267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1817011816813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1817011816913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908505908406 + 908505908407.

It is an arithmetic number, because the mean of its divisors is an integer number (908505908407).

Almost surely, 2^{1817011816813} is an apocalyptic number.

It is an amenable number.

1817011816813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817011816813 is an equidigital number, since it uses as much as digits as its factorization.

1817011816813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 46.

The spelling of 1817011816813 in words is "one trillion, eight hundred seventeen billion, eleven million, eight hundred sixteen thousand, eight hundred thirteen".