2118444446781 has 12 divisors (see below), whose sum is σ = 3295358028508. Its totient is φ = 1303658121024.

The previous prime is 2118444446773. The next prime is 2118444446837. The reversal of 2118444446781 is 1876444448112.

2118444446781 is a `hidden beast` number, since 2 + 1 + 1 + 84 + 44 + 446 + 7 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 479189295225 + 1639255151556 = 692235^2 + 1280334^2 .

It is not a de Polignac number, because 2118444446781 - 2³ = 2118444446773 is a prime.

It is a super-2 number, since 2×2118444446781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118444446771) 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 in 11 ways as a sum of consecutive naturals, for example, 9053181280 + ... + 9053181513.

Almost surely, 2^{2118444446781} is an apocalyptic number.

It is an amenable number.

2118444446781 is a deficient number, since it is larger than the sum of its proper divisors (1176913581727).

2118444446781 is a wasteful number, since it uses less digits than its factorization.

2118444446781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18106362812 (or 18106362809 counting only the distinct ones).

The product of its digits is 5505024, while the sum is 54.

The spelling of 2118444446781 in words is "two trillion, one hundred eighteen billion, four hundred forty-four million, four hundred forty-six thousand, seven hundred eighty-one".