11557520436817 has 4 divisors (see below), whose sum is σ = 11557696735156. Its totient is φ = 11557344138480.

The previous prime is 11557520436799. The next prime is 11557520436823. The reversal of 11557520436817 is 71863402575511.

11557520436817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133282676241 + 11424237760576 = 365079^2 + 3379976^2 .

It is a cyclic number.

It is not a de Polignac number, because 11557520436817 - 2⁷ = 11557520436689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11557520436877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88050798 + ... + 88181959.

It is an arithmetic number, because the mean of its divisors is an integer number (2889424183789).

Almost surely, 2^{11557520436817} is an apocalyptic number.

It is an amenable number.

11557520436817 is a deficient number, since it is larger than the sum of its proper divisors (176298339).

11557520436817 is an equidigital number, since it uses as much as digits as its factorization.

11557520436817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176298338.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 11557520436817 in words is "eleven trillion, five hundred fifty-seven billion, five hundred twenty million, four hundred thirty-six thousand, eight hundred seventeen".