11423320543 has 4 divisors (see below), whose sum is σ = 12024547960. Its totient is φ = 10822093128.

The previous prime is 11423320537. The next prime is 11423320547. The reversal of 11423320543 is 34502332411.

It is a happy number.

11423320543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34502332411 = 32537 ⋅1060403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11423320543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11423320547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300613680 + ... + 300613717.

It is an arithmetic number, because the mean of its divisors is an integer number (3006136990).

Almost surely, 2^11423320543 is an apocalyptic number.

11423320543 is a deficient number, since it is larger than the sum of its proper divisors (601227417).

11423320543 is an equidigital number, since it uses as much as digits as its factorization.

11423320543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601227416.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 11423320543 its reverse (34502332411), we get a palindrome (45925652954).

The spelling of 11423320543 in words is "eleven billion, four hundred twenty-three million, three hundred twenty thousand, five hundred forty-three".