12120554178 has 64 divisors (see below), whose sum is σ = 27282528000. Its totient is φ = 3988144512.

The previous prime is 12120554167. The next prime is 12120554183. The reversal of 12120554178 is 87145502121.

It is a happy number.

12120554178 is a `hidden beast` number, since 1 + 21 + 20 + 5 + 541 + 78 = 666.

12120554178 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3492228 + ... + 3495696.

It is an arithmetic number, because the mean of its divisors is an integer number (426289500).

Almost surely, 2^12120554178 is an apocalyptic number.

12120554178 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12120554178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13641264000).

12120554178 is an abundant number, since it is smaller than the sum of its proper divisors (15161973822).

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

12120554178 is a wasteful number, since it uses less digits than its factorization.

12120554178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296 (or 4290 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 12120554178 in words is "twelve billion, one hundred twenty million, five hundred fifty-four thousand, one hundred seventy-eight".