11111234555556 has 18 divisors (see below), whose sum is σ = 28086731793302. Its totient is φ = 3703744851840.

The previous prime is 11111234555539. The next prime is 11111234555573. The reversal of 11111234555556 is 65555543211111.

11111234555556 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 1 + 2 + 3 + 45 + 55 + 556 = 666.

It is an interprime number because it is at equal distance from previous prime (11111234555539) and next prime (11111234555573).

It can be written as a sum of positive squares in only one way, i.e., 9849454131456 + 1261780424100 = 3138384^2 + 1123290^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 10.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 154322702125 + ... + 154322702196.

Almost surely, 2^{11111234555556} is an apocalyptic number.

It is an amenable number.

11111234555556 is an abundant number, since it is smaller than the sum of its proper divisors (16975497237746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111234555556 is a wasteful number, since it uses less digits than its factorization.

11111234555556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308645404331 (or 308645404326 counting only the distinct ones).

The product of its digits is 450000, while the sum is 45.

Adding to 11111234555556 its reverse (65555543211111), we get a palindrome (76666777766667).

The spelling of 11111234555556 in words is "eleven trillion, one hundred eleven billion, two hundred thirty-four million, five hundred fifty-five thousand, five hundred fifty-six".