11111110555556 has 48 divisors (see below), whose sum is σ = 21268605093120. Its totient is φ = 5037064032000.

The previous prime is 11111110555553. The next prime is 11111110555561. The reversal of 11111110555556 is 65555501111111.

It is not an unprimeable number, because it can be changed into a prime (11111110555553) 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 15 ways as a sum of consecutive naturals, for example, 56205446 + ... + 56402786.

It is an arithmetic number, because the mean of its divisors is an integer number (443095939440).

Almost surely, 2^{11111110555556} is an apocalyptic number.

It is an amenable number.

11111110555556 is a deficient number, since it is larger than the sum of its proper divisors (10157494537564).

11111110555556 is a wasteful number, since it uses less digits than its factorization.

11111110555556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200756 (or 200754 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 38.

Adding to 11111110555556 its reverse (65555501111111), we get a palindrome (76666611666667).

It can be divided in two parts, 11111110555 and 556, that added together give a palindrome (11111111111).

The spelling of 11111110555556 in words is "eleven trillion, one hundred eleven billion, one hundred ten million, five hundred fifty-five thousand, five hundred fifty-six".