1818365783809 has 2 divisors, whose sum is σ = 1818365783810. Its totient is φ = 1818365783808.

The previous prime is 1818365783797. The next prime is 1818365783821. The reversal of 1818365783809 is 9083875638181.

It is a balanced prime because it is at equal distance from previous prime (1818365783797) and next prime (1818365783821).

It can be written as a sum of positive squares in only one way, i.e., 1776462465600 + 41903318209 = 1332840^2 + 204703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818365783809 - 2¹⁷ = 1818365652737 is a prime.

It is a super-3 number, since 3×1818365783809³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1818365783869) 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, 909182891904 + 909182891905.

It is an arithmetic number, because the mean of its divisors is an integer number (909182891905).

Almost surely, 2^{1818365783809} is an apocalyptic number.

It is an amenable number.

1818365783809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818365783809 is an equidigital number, since it uses as much as digits as its factorization.

1818365783809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69672960, while the sum is 67.

The spelling of 1818365783809 in words is "one trillion, eight hundred eighteen billion, three hundred sixty-five million, seven hundred eighty-three thousand, eight hundred nine".