11556331636 has 6 divisors (see below), whose sum is σ = 20223580370. Its totient is φ = 5778165816.

The previous prime is 11556331607. The next prime is 11556331637. The reversal of 11556331636 is 63613365511.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10292102500 + 1264229136 = 101450^2 + 35556^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556331637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1444541451 + ... + 1444541458.

Almost surely, 2^11556331636 is an apocalyptic number.

It is an amenable number.

11556331636 is a deficient number, since it is larger than the sum of its proper divisors (8667248734).

11556331636 is a wasteful number, since it uses less digits than its factorization.

11556331636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889082913 (or 2889082911 counting only the distinct ones).

The product of its digits is 145800, while the sum is 40.

The spelling of 11556331636 in words is "eleven billion, five hundred fifty-six million, three hundred thirty-one thousand, six hundred thirty-six".