11563551660 has 96 divisors (see below), whose sum is σ = 33030208512. Its totient is φ = 3021640960.

The previous prime is 11563551653. The next prime is 11563551673. The reversal of 11563551660 is 6615536511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3276817 + ... + 3280343.

It is an arithmetic number, because the mean of its divisors is an integer number (344064672).

Almost surely, 2^11563551660 is an apocalyptic number.

11563551660 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 11563551660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16515104256).

11563551660 is an abundant number, since it is smaller than the sum of its proper divisors (21466656852).

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

11563551660 is a wasteful number, since it uses less digits than its factorization.

11563551660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623 (or 4621 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 11563551660 in words is "eleven billion, five hundred sixty-three million, five hundred fifty-one thousand, six hundred sixty".