11805564443 has 4 divisors (see below), whose sum is σ = 12426909960. Its totient is φ = 11184218928.

The previous prime is 11805564437. The next prime is 11805564451. The reversal of 11805564443 is 34446550811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34446550811 = 43 ⋅801082577.

It is a cyclic number.

It is not a de Polignac number, because 11805564443 - 2⁸ = 11805564187 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 11805564443.

It is not an unprimeable number, because it can be changed into a prime (11805564403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310672730 + ... + 310672767.

It is an arithmetic number, because the mean of its divisors is an integer number (3106727490).

Almost surely, 2^11805564443 is an apocalyptic number.

11805564443 is a deficient number, since it is larger than the sum of its proper divisors (621345517).

11805564443 is an equidigital number, since it uses as much as digits as its factorization.

11805564443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621345516.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 11805564443 in words is "eleven billion, eight hundred five million, five hundred sixty-four thousand, four hundred forty-three".