11521356436556 has 24 divisors (see below), whose sum is σ = 20405981552880. Its totient is φ = 5691080670912.

The previous prime is 11521356436531. The next prime is 11521356436589. The reversal of 11521356436556 is 65563465312511.

It is a super-2 number, since 2×11521356436556² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11521356436498 and 11521356436507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9546230 + ... + 10685186.

It is an arithmetic number, because the mean of its divisors is an integer number (850249231370).

Almost surely, 2^{11521356436556} is an apocalyptic number.

It is an amenable number.

11521356436556 is a deficient number, since it is larger than the sum of its proper divisors (8884625116324).

11521356436556 is a wasteful number, since it uses less digits than its factorization.

11521356436556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169513 (or 1169511 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 53.

The spelling of 11521356436556 in words is "eleven trillion, five hundred twenty-one billion, three hundred fifty-six million, four hundred thirty-six thousand, five hundred fifty-six".