11866166520 has 256 divisors, whose sum is σ = 41022374400. Its totient is φ = 2721392640.

The previous prime is 11866166519. The next prime is 11866166527. The reversal of 11866166520 is 2566166811.

11866166520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11866166527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1804759 + ... + 1811321.

It is an arithmetic number, because the mean of its divisors is an integer number (160243650).

Almost surely, 2^11866166520 is an apocalyptic number.

11866166520 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 11866166520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20511187200).

11866166520 is an abundant number, since it is smaller than the sum of its proper divisors (29156207880).

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

11866166520 is a wasteful number, since it uses less digits than its factorization.

11866166520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670 (or 6666 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 11866166520 in words is "eleven billion, eight hundred sixty-six million, one hundred sixty-six thousand, five hundred twenty".