11111115555558 has 20 divisors (see below), whose sum is σ = 24897129300780. Its totient is φ = 3703705185132.

The previous prime is 11111115555523. The next prime is 11111115555581. The reversal of 11111115555558 is 85555551111111.

11111115555558 is a `hidden beast` number, since 11 + 11 + 11 + 15 + 5 + 55 + 558 = 666.

It is a super-3 number, since 3×11111115555558³ (a number of 40 digits) contains 333 as substring.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 34293566368 + ... + 34293566691.

It is an arithmetic number, because the mean of its divisors is an integer number (1244856465039).

Almost surely, 2^{11111115555558} is an apocalyptic number.

11111115555558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11111115555558 is an abundant number, since it is smaller than the sum of its proper divisors (13786013745222).

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

11111115555558 is an equidigital number, since it uses as much as digits as its factorization.

11111115555558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68587133073 (or 68587133064 counting only the distinct ones).

The product of its digits is 125000, while the sum is 45.

Adding to 11111115555558 its reverse (85555551111111), we get a palindrome (96666666666669).

The spelling of 11111115555558 in words is "eleven trillion, one hundred eleven billion, one hundred fifteen million, five hundred fifty-five thousand, five hundred fifty-eight".