11556421766536 has 16 divisors (see below), whose sum is σ = 21668358318300. Its totient is φ = 5778192881664.

The previous prime is 11556421766473. The next prime is 11556421766563. The reversal of 11556421766536 is 63566712465511.

It can be written as a sum of positive squares in 2 ways, for example, as 11521231758436 + 35190008100 = 3394294^2 + 187590^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706720 + ... + 4859248.

Almost surely, 2^{11556421766536} is an apocalyptic number.

It is an amenable number.

11556421766536 is a deficient number, since it is larger than the sum of its proper divisors (10111936551764).

11556421766536 is a wasteful number, since it uses less digits than its factorization.

11556421766536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500408 (or 4500404 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 58.

The spelling of 11556421766536 in words is "eleven trillion, five hundred fifty-six billion, four hundred twenty-one million, seven hundred sixty-six thousand, five hundred thirty-six".