12555440111 has 4 divisors (see below), whose sum is σ = 12557452992. Its totient is φ = 12553427232.

The previous prime is 12555440099. The next prime is 12555440137. The reversal of 12555440111 is 11104455521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11104455521 = 13411 ⋅828011.

It is a cyclic number.

It is not a de Polignac number, because 12555440111 - 2⁶ = 12555440047 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 (12555440171) 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, 997055 + ... + 1009568.

It is an arithmetic number, because the mean of its divisors is an integer number (3139363248).

Almost surely, 2^12555440111 is an apocalyptic number.

12555440111 is a deficient number, since it is larger than the sum of its proper divisors (2012881).

12555440111 is an equidigital number, since it uses as much as digits as its factorization.

12555440111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012880.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 12555440111 its reverse (11104455521), we get a palindrome (23659895632).

The spelling of 12555440111 in words is "twelve billion, five hundred fifty-five million, four hundred forty thousand, one hundred eleven".