1811549099844 has 81 divisors (see below), whose sum is σ = 5033575284829. Its totient is φ = 548927353920.

The previous prime is 1811549099839. The next prime is 1811549099849. The reversal of 1811549099844 is 4489909451181.

The square root of 1811549099844 is 1345938.

It is a perfect power (a square), and thus also a powerful number.

1811549099844 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 549 + 0 + 9 + 9 + 84 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1811549099839) and next prime (1811549099849).

It can be written as a sum of positive squares in only one way, i.e., 978140780100 + 833408319744 = 989010^2 + 912912^2 .

It is a super-2 number, since 2×1811549099844² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1811549099849) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 88821712 + ... + 88842104.

Almost surely, 2^{1811549099844} is an apocalyptic number.

1811549099844 is the 1345938-th square number.

It is an amenable number.

1811549099844 is an abundant number, since it is smaller than the sum of its proper divisors (3222026184985).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1811549099844 is an equidigital number, since it uses as much as digits as its factorization.

1811549099844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40818 (or 20409 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 63.

The spelling of 1811549099844 in words is "one trillion, eight hundred eleven billion, five hundred forty-nine million, ninety-nine thousand, eight hundred forty-four".