11661811760 has 80 divisors (see below), whose sum is σ = 28175696640. Its totient is φ = 4483476480.

The previous prime is 11661811747. The next prime is 11661811771. The reversal of 11661811760 is 6711816611.

It is a happy number.

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

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, 506090 + ... + 528630.

It is an arithmetic number, because the mean of its divisors is an integer number (352196208).

Almost surely, 2^11661811760 is an apocalyptic number.

11661811760 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 11661811760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14087848320).

11661811760 is an abundant number, since it is smaller than the sum of its proper divisors (16513884880).

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

11661811760 is a wasteful number, since it uses less digits than its factorization.

11661811760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22806 (or 22800 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 38.

The spelling of 11661811760 in words is "eleven billion, six hundred sixty-one million, eight hundred eleven thousand, seven hundred sixty".