18518383551797 has 2 divisors, whose sum is σ = 18518383551798. Its totient is φ = 18518383551796.

The previous prime is 18518383551751. The next prime is 18518383551859. The reversal of 18518383551797 is 79715538381581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12862329515281 + 5656054036516 = 3586409^2 + 2378246^2 .

It is a cyclic number.

It is not a de Polignac number, because 18518383551797 - 2⁴⁰ = 17418871924021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18518383551797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518383551727) 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, 9259191775898 + 9259191775899.

It is an arithmetic number, because the mean of its divisors is an integer number (9259191775899).

Almost surely, 2^{18518383551797} is an apocalyptic number.

It is an amenable number.

18518383551797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518383551797 is an equidigital number, since it uses as much as digits as its factorization.

18518383551797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016000, while the sum is 71.

The spelling of 18518383551797 in words is "eighteen trillion, five hundred eighteen billion, three hundred eighty-three million, five hundred fifty-one thousand, seven hundred ninety-seven".