12666541937868 has 384 divisors, whose sum is σ = 41735493632000. Its totient is φ = 3231760343040.

The previous prime is 12666541937831. The next prime is 12666541937891. The reversal of 12666541937868 is 86873914566621.

It is a junction number, because it is equal to n+sod(n) for n = 12666541937796 and 12666541937805.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1257969138 + ... + 1257979206.

Almost surely, 2^{12666541937868} is an apocalyptic number.

12666541937868 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 12666541937868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20867746816000).

12666541937868 is an abundant number, since it is smaller than the sum of its proper divisors (29068951694132).

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

12666541937868 is a wasteful number, since it uses less digits than its factorization.

12666541937868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14262 (or 14254 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 72.

The spelling of 12666541937868 in words is "twelve trillion, six hundred sixty-six billion, five hundred forty-one million, nine hundred thirty-seven thousand, eight hundred sixty-eight".