11556633213 has 24 divisors (see below), whose sum is σ = 16782846080. Its totient is φ = 7663014720.

The previous prime is 11556633181. The next prime is 11556633233. The reversal of 11556633213 is 31233665511.

11556633213 is a `hidden beast` number, since 1 + 1 + 5 + 5 + 6 + 633 + 2 + 13 = 666.

It is not a de Polignac number, because 11556633213 - 2⁵ = 11556633181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556633233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1564593 + ... + 1571961.

Almost surely, 2^11556633213 is an apocalyptic number.

It is an amenable number.

11556633213 is a deficient number, since it is larger than the sum of its proper divisors (5226212867).

11556633213 is a wasteful number, since it uses less digits than its factorization.

11556633213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8289 (or 8286 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The spelling of 11556633213 in words is "eleven billion, five hundred fifty-six million, six hundred thirty-three thousand, two hundred thirteen".