11685431133 has 12 divisors (see below), whose sum is σ = 16972212348. Its totient is φ = 7747246080.

The previous prime is 11685431101. The next prime is 11685431137. The reversal of 11685431133 is 33113458611.

11685431133 is a `hidden beast` number, since 1 + 16 + 85 + 431 + 133 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3098258244 + 8587172889 = 55662^2 + 92667^2 .

It is not a de Polignac number, because 11685431133 - 2⁵ = 11685431101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11685431137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3585060 + ... + 3588317.

It is an arithmetic number, because the mean of its divisors is an integer number (1414351029).

Almost surely, 2^11685431133 is an apocalyptic number.

It is an amenable number.

11685431133 is a deficient number, since it is larger than the sum of its proper divisors (5286781215).

11685431133 is a wasteful number, since it uses less digits than its factorization.

11685431133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7173564 (or 7173561 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

Adding to 11685431133 its reverse (33113458611), we get a palindrome (44798889744).

The spelling of 11685431133 in words is "eleven billion, six hundred eighty-five million, four hundred thirty-one thousand, one hundred thirty-three".