11811538843 has 16 divisors (see below), whose sum is σ = 12807357696. Its totient is φ = 10828321920.

The previous prime is 11811538831. The next prime is 11811538867. The reversal of 11811538843 is 34883511811.

It is not a de Polignac number, because 11811538843 - 2⁹ = 11811538331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11811538843.

It is not an unprimeable number, because it can be changed into a prime (11811538813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2653846 + ... + 2658292.

It is an arithmetic number, because the mean of its divisors is an integer number (800459856).

Almost surely, 2^11811538843 is an apocalyptic number.

11811538843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11811538843 is a deficient number, since it is larger than the sum of its proper divisors (995818853).

11811538843 is a wasteful number, since it uses less digits than its factorization.

11811538843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814.

The product of its digits is 92160, while the sum is 43.

The spelling of 11811538843 in words is "eleven billion, eight hundred eleven million, five hundred thirty-eight thousand, eight hundred forty-three".