13666550066686 has 24 divisors (see below), whose sum is σ = 22551170618592. Its totient is φ = 6207021717600.

The previous prime is 13666550066681. The next prime is 13666550066783. The reversal of 13666550066686 is 68666005566631.

It is a happy number.

It is a super-2 number, since 2×13666550066686² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666550066681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22640095 + ... + 23235898.

It is an arithmetic number, because the mean of its divisors is an integer number (939632109108).

Almost surely, 2^{13666550066686} is an apocalyptic number.

13666550066686 is a deficient number, since it is larger than the sum of its proper divisors (8884620551906).

13666550066686 is a wasteful number, since it uses less digits than its factorization.

13666550066686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45877248 (or 45877237 counting only the distinct ones).

The product of its (nonzero) digits is 167961600, while the sum is 64.

Subtracting 13666550066686 from its reverse (68666005566631), we obtain a palindrome (54999455499945).

The spelling of 13666550066686 in words is "thirteen trillion, six hundred sixty-six billion, five hundred fifty million, sixty-six thousand, six hundred eighty-six".