11115512871857 has 2 divisors, whose sum is σ = 11115512871858. Its totient is φ = 11115512871856.

The previous prime is 11115512871817. The next prime is 11115512871913. The reversal of 11115512871857 is 75817821551111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11099565223201 + 15947648656 = 3331601^2 + 126284^2 .

It is an emirp because it is prime and its reverse (75817821551111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11115512871857 - 2⁸ = 11115512871601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11115512871799 and 11115512871808.

It is not a weakly prime, because it can be changed into another prime (11115512871817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5557756435928 + 5557756435929.

It is an arithmetic number, because the mean of its divisors is an integer number (5557756435929).

Almost surely, 2^{11115512871857} is an apocalyptic number.

It is an amenable number.

11115512871857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11115512871857 is an equidigital number, since it uses as much as digits as its factorization.

11115512871857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 784000, while the sum is 53.

The spelling of 11115512871857 in words is "eleven trillion, one hundred fifteen billion, five hundred twelve million, eight hundred seventy-one thousand, eight hundred fifty-seven".