11156543423 has 4 divisors (see below), whose sum is σ = 11156825088. Its totient is φ = 11156261760.

The previous prime is 11156543417. The next prime is 11156543441. The reversal of 11156543423 is 32434565111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32434565111 = 13 ⋅2494966547.

It is a cyclic number.

It is not a de Polignac number, because 11156543423 - 2¹⁰ = 11156542399 is a prime.

It is a super-2 number, since 2×11156543423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156543413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69311 + ... + 164672.

It is an arithmetic number, because the mean of its divisors is an integer number (2789206272).

Almost surely, 2^11156543423 is an apocalyptic number.

11156543423 is a deficient number, since it is larger than the sum of its proper divisors (281665).

11156543423 is an equidigital number, since it uses as much as digits as its factorization.

11156543423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281664.

The product of its digits is 43200, while the sum is 35.

The spelling of 11156543423 in words is "eleven billion, one hundred fifty-six million, five hundred forty-three thousand, four hundred twenty-three".