13121113566 has 16 divisors (see below), whose sum is σ = 28627884288. Its totient is φ = 3976095000.

The previous prime is 13121113549. The next prime is 13121113591. The reversal of 13121113566 is 66531112131.

13121113566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 99402310 + ... + 99402441.

It is an arithmetic number, because the mean of its divisors is an integer number (1789242768).

Almost surely, 2^13121113566 is an apocalyptic number.

13121113566 is an abundant number, since it is smaller than the sum of its proper divisors (15506770722).

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

13121113566 is a wasteful number, since it uses less digits than its factorization.

13121113566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198804767.

The product of its digits is 3240, while the sum is 30.

Adding to 13121113566 its reverse (66531112131), we get a palindrome (79652225697).

The spelling of 13121113566 in words is "thirteen billion, one hundred twenty-one million, one hundred thirteen thousand, five hundred sixty-six".