12012171671808 has 1440 divisors, whose sum is σ = 46180873625600. Its totient is φ = 3013878067200.

The previous prime is 12012171671791. The next prime is 12012171671809. The reversal of 12012171671808 is 80817617121021.

It is not an unprimeable number, because it can be changed into a prime (12012171671809) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 21960094191 + ... + 21960094737.

Almost surely, 2^{12012171671808} is an apocalyptic number.

12012171671808 is a gapful number since it is divisible by the number (18) 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 12012171671808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23090436812800).

12012171671808 is an abundant number, since it is smaller than the sum of its proper divisors (34168701953792).

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

12012171671808 is an frugal number, since it uses more digits than its factorization.

12012171671808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 45.

Adding to 12012171671808 its reverse (80817617121021), we get a palindrome (92829788792829).

It can be divided in two parts, 1201217 and 1671808, that added together give a square (2873025 = 1695²).

The spelling of 12012171671808 in words is "twelve trillion, twelve billion, one hundred seventy-one million, six hundred seventy-one thousand, eight hundred eight".