13111056666 has 96 divisors (see below), whose sum is σ = 31271984640. Its totient is φ = 3951506592.

The previous prime is 13111056661. The next prime is 13111056667. The reversal of 13111056666 is 66665011131.

It is a self number, because there is not a number n which added to its sum of digits gives 13111056666.

It is not an unprimeable number, because it can be changed into a prime (13111056661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4112325 + ... + 4115511.

It is an arithmetic number, because the mean of its divisors is an integer number (325749840).

Almost surely, 2^13111056666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13111056666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15635992320).

13111056666 is an abundant number, since it is smaller than the sum of its proper divisors (18160927974).

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

13111056666 is a wasteful number, since it uses less digits than its factorization.

13111056666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760 (or 3757 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

Adding to 13111056666 its reverse (66665011131), we get a palindrome (79776067797).

The spelling of 13111056666 in words is "thirteen billion, one hundred eleven million, fifty-six thousand, six hundred sixty-six".