11556345121213 has 4 divisors (see below), whose sum is σ = 11589457858300. Its totient is φ = 11523232384128.

The previous prime is 11556345121199. The next prime is 11556345121219. The reversal of 11556345121213 is 31212154365511.

11556345121213 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 7031820490564 + 4524524630649 = 2651758^2 + 2127093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11556345121213 is a prime.

It is a super-2 number, since 2×11556345121213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556345121219) 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, 16556368020 + ... + 16556368717.

It is an arithmetic number, because the mean of its divisors is an integer number (2897364464575).

Almost surely, 2^{11556345121213} is an apocalyptic number.

It is an amenable number.

11556345121213 is a deficient number, since it is larger than the sum of its proper divisors (33112737087).

11556345121213 is an equidigital number, since it uses as much as digits as its factorization.

11556345121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33112737086.

The product of its digits is 108000, while the sum is 40.

Adding to 11556345121213 its reverse (31212154365511), we get a palindrome (42768499486724).

The spelling of 11556345121213 in words is "eleven trillion, five hundred fifty-six billion, three hundred forty-five million, one hundred twenty-one thousand, two hundred thirteen".