1818382222181 has 12 divisors (see below), whose sum is σ = 2127487904172. Its totient is φ = 1549604000448.

The previous prime is 1818382222169. The next prime is 1818382222183. The reversal of 1818382222181 is 1812222838181.

It can be written as a sum of positive squares in 2 ways, for example, as 1650479784100 + 167902438081 = 1284710^2 + 409759^2 .

It is not a de Polignac number, because 1818382222181 - 2¹⁰ = 1818382221157 is a prime.

It is a super-2 number, since 2×1818382222181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818382222183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107245400 + ... + 107262353.

It is an arithmetic number, because the mean of its divisors is an integer number (177290658681).

Almost surely, 2^{1818382222181} is an apocalyptic number.

It is an amenable number.

1818382222181 is a deficient number, since it is larger than the sum of its proper divisors (309105681991).

1818382222181 is a wasteful number, since it uses less digits than its factorization.

1818382222181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214507940 (or 214507933 counting only the distinct ones).

The product of its digits is 196608, while the sum is 47.

The spelling of 1818382222181 in words is "one trillion, eight hundred eighteen billion, three hundred eighty-two million, two hundred twenty-two thousand, one hundred eighty-one".