11560665520 has 80 divisors (see below), whose sum is σ = 28356042240. Its totient is φ = 4371155712.

The previous prime is 11560665451. The next prime is 11560665587. The reversal of 11560665520 is 2556606511.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 11560665520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695547 + ... + 711973.

It is an arithmetic number, because the mean of its divisors is an integer number (354450528).

Almost surely, 2^11560665520 is an apocalyptic number.

11560665520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11560665520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14178021120).

11560665520 is an abundant number, since it is smaller than the sum of its proper divisors (16795376720).

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

11560665520 is a wasteful number, since it uses less digits than its factorization.

11560665520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16922 (or 16916 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 11560665520 in words is "eleven billion, five hundred sixty million, six hundred sixty-five thousand, five hundred twenty".