13666983811866 has 192 divisors, whose sum is σ = 37422185988096. Its totient is φ = 3501713203200.

The previous prime is 13666983811847. The next prime is 13666983811867. The reversal of 13666983811866 is 66811838966631.

It is a junction number, because it is equal to n+sod(n) for n = 13666983811794 and 13666983811803.

It is not an unprimeable number, because it can be changed into a prime (13666983811867) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 36502551 + ... + 36875061.

It is an arithmetic number, because the mean of its divisors is an integer number (194907218688).

Almost surely, 2^{13666983811866} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13666983811866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18711092994048).

13666983811866 is an abundant number, since it is smaller than the sum of its proper divisors (23755202176230).

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

13666983811866 is a wasteful number, since it uses less digits than its factorization.

13666983811866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372897 (or 372894 counting only the distinct ones).

The product of its digits is 322486272, while the sum is 72.

The spelling of 13666983811866 in words is "thirteen trillion, six hundred sixty-six billion, nine hundred eighty-three million, eight hundred eleven thousand, eight hundred sixty-six".