11555204423 has 4 divisors (see below), whose sum is σ = 13205947920. Its totient is φ = 9904460928.

The previous prime is 11555204387. The next prime is 11555204431. The reversal of 11555204423 is 32440255511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11555204423 - 2³⁰ = 10481462599 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 11555204423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555104423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825371738 + ... + 825371751.

It is an arithmetic number, because the mean of its divisors is an integer number (3301486980).

Almost surely, 2^11555204423 is an apocalyptic number.

11555204423 is a deficient number, since it is larger than the sum of its proper divisors (1650743497).

11555204423 is an equidigital number, since it uses as much as digits as its factorization.

11555204423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650743496.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 11555204423 its reverse (32440255511), we get a palindrome (43995459934).

The spelling of 11555204423 in words is "eleven billion, five hundred fifty-five million, two hundred four thousand, four hundred twenty-three".