11816208133 has 4 divisors (see below), whose sum is σ = 11823427980. Its totient is φ = 11808988288.

The previous prime is 11816208109. The next prime is 11816208181. The reversal of 11816208133 is 33180261811.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4913589409 + 6902618724 = 70097^2 + 83082^2 .

It is a cyclic number.

It is not a de Polignac number, because 11816208133 - 2²⁹ = 11279337221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11816208233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3607468 + ... + 3610741.

It is an arithmetic number, because the mean of its divisors is an integer number (2955856995).

Almost surely, 2^11816208133 is an apocalyptic number.

It is an amenable number.

11816208133 is a deficient number, since it is larger than the sum of its proper divisors (7219847).

11816208133 is an equidigital number, since it uses as much as digits as its factorization.

11816208133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7219846.

The product of its (nonzero) digits is 6912, while the sum is 34.

Adding to 11816208133 its reverse (33180261811), we get a palindrome (44996469944).

The spelling of 11816208133 in words is "eleven billion, eight hundred sixteen million, two hundred eight thousand, one hundred thirty-three".