11988656550 has 144 divisors (see below), whose sum is σ = 35883797040. Its totient is φ = 2849253120.

The previous prime is 11988656543. The next prime is 11988656569. The reversal of 11988656550 is 5565688911.

11988656550 is a `hidden beast` number, since 1 + 1 + 9 + 8 + 86 + 5 + 6 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 134317 + ... + 204983.

It is an arithmetic number, because the mean of its divisors is an integer number (249193035).

Almost surely, 2^11988656550 is an apocalyptic number.

11988656550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11988656550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17941898520).

11988656550 is an abundant number, since it is smaller than the sum of its proper divisors (23895140490).

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

11988656550 is a wasteful number, since it uses less digits than its factorization.

11988656550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70727 (or 70719 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 54.

The spelling of 11988656550 in words is "eleven billion, nine hundred eighty-eight million, six hundred fifty-six thousand, five hundred fifty".