11666135813 has 2 divisors, whose sum is σ = 11666135814. Its totient is φ = 11666135812.

The previous prime is 11666135749. The next prime is 11666135827. The reversal of 11666135813 is 31853166611.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6429153124 + 5236982689 = 80182^2 + 72367^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666135813 - 2⁶ = 11666135749 is a prime.

It is a super-2 number, since 2×11666135813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11666135843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833067906 + 5833067907.

It is an arithmetic number, because the mean of its divisors is an integer number (5833067907).

Almost surely, 2^11666135813 is an apocalyptic number.

It is an amenable number.

11666135813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666135813 is an equidigital number, since it uses as much as digits as its factorization.

11666135813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The spelling of 11666135813 in words is "eleven billion, six hundred sixty-six million, one hundred thirty-five thousand, eight hundred thirteen".