1898182818981 has 12 divisors (see below), whose sum is σ = 2741909022060. Its totient is φ = 1265413953600.

The previous prime is 1898182818971. The next prime is 1898182819003.

1898182818981 is a `hidden beast` number, since 189 + 8 + 18 + 281 + 89 + 81 = 666.

1898182818981 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 1008499986081 + 889682832900 = 1004241^2 + 943230^2 .

It is not a de Polignac number, because 1898182818981 - 2¹³ = 1898182810789 is a prime.

It is a super-2 number, since 2×1898182818981² (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 (1898182818971) 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, 3145570 + ... + 3700131.

It is an arithmetic number, because the mean of its divisors is an integer number (228492418505).

Almost surely, 2^{1898182818981} is an apocalyptic number.

It is an amenable number.

1898182818981 is a deficient number, since it is larger than the sum of its proper divisors (843726203079).

1898182818981 is a wasteful number, since it uses less digits than its factorization.

1898182818981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876516 (or 6876513 counting only the distinct ones).

The product of its digits is 42467328, while the sum is 72.

The spelling of 1898182818981 in words is "one trillion, eight hundred ninety-eight billion, one hundred eighty-two million, eight hundred eighteen thousand, nine hundred eighty-one".