11556605015406 has 64 divisors (see below), whose sum is σ = 28031692412160. Its totient is φ = 3500041488480.

The previous prime is 11556605015401. The next prime is 11556605015419. The reversal of 11556605015406 is 60451050665511.

11556605015406 is a `hidden beast` number, since 1 + 1 + 5 + 56 + 6 + 0 + 50 + 1 + 540 + 6 = 666.

It is a super-2 number, since 2×11556605015406² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556605015401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4382161 + ... + 6505116.

It is an arithmetic number, because the mean of its divisors is an integer number (437995193940).

Almost surely, 2^{11556605015406} is an apocalyptic number.

11556605015406 is an abundant number, since it is smaller than the sum of its proper divisors (16475087396754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11556605015406 is a wasteful number, since it uses less digits than its factorization.

11556605015406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10889086 (or 10889080 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 11556605015406 in words is "eleven trillion, five hundred fifty-six billion, six hundred five million, fifteen thousand, four hundred six".