1818514543693 has 2 divisors, whose sum is σ = 1818514543694. Its totient is φ = 1818514543692.

The previous prime is 1818514543627. The next prime is 1818514543723. The reversal of 1818514543693 is 3963454158181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1048899608964 + 769614934729 = 1024158^2 + 877277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818514543693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818514540693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909257271846 + 909257271847.

It is an arithmetic number, because the mean of its divisors is an integer number (909257271847).

Almost surely, 2^{1818514543693} is an apocalyptic number.

It is an amenable number.

1818514543693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818514543693 is an equidigital number, since it uses as much as digits as its factorization.

1818514543693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12441600, while the sum is 58.

The spelling of 1818514543693 in words is "one trillion, eight hundred eighteen billion, five hundred fourteen million, five hundred forty-three thousand, six hundred ninety-three".