12180478273866 has 160 divisors (see below), whose sum is σ = 31398634143360. Its totient is φ = 3457190937600.

The previous prime is 12180478273807. The next prime is 12180478273867. The reversal of 12180478273866 is 66837287408121.

It is a happy number.

12180478273866 is a `hidden beast` number, since 1 + 2 + 1 + 80 + 478 + 2 + 7 + 3 + 86 + 6 = 666.

12180478273866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (12180478273867) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 111722761 + ... + 111831731.

It is an arithmetic number, because the mean of its divisors is an integer number (196241463396).

Almost surely, 2^{12180478273866} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12180478273866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15699317071680).

12180478273866 is an abundant number, since it is smaller than the sum of its proper divisors (19218155869494).

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

12180478273866 is a wasteful number, since it uses less digits than its factorization.

12180478273866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109642 (or 109633 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 63.

The spelling of 12180478273866 in words is "twelve trillion, one hundred eighty billion, four hundred seventy-eight million, two hundred seventy-three thousand, eight hundred sixty-six".