11111115555557 has 6 divisors (see below), whose sum is σ = 11296251050994. Its totient is φ = 10928966116560.

The previous prime is 11111115555523. The next prime is 11111115555581. The reversal of 11111115555557 is 75555551111111.

It is a Cunningham number, because it is equal to 3333334²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 11111115555556 = 1^2 + 3333334^2 .

It is not a de Polignac number, because 11111115555557 - 2²⁰ = 11111114506981 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111115755557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1493024438 + ... + 1493031879.

It is an arithmetic number, because the mean of its divisors is an integer number (1882708508499).

Almost surely, 2^{11111115555557} is an apocalyptic number.

It is an amenable number.

11111115555557 is a deficient number, since it is larger than the sum of its proper divisors (185135495437).

11111115555557 is an frugal number, since it uses more digits than its factorization.

11111115555557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986056439 (or 2986056378 counting only the distinct ones).

The product of its digits is 109375, while the sum is 44.

Adding to 11111115555557 its reverse (75555551111111), we get a palindrome (86666666666668).

The spelling of 11111115555557 in words is "eleven trillion, one hundred eleven billion, one hundred fifteen million, five hundred fifty-five thousand, five hundred fifty-seven".