11966115409 has 4 divisors (see below), whose sum is σ = 11983433200. Its totient is φ = 11948797620.

The previous prime is 11966115407. The next prime is 11966115437. The reversal of 11966115409 is 90451166911.

11966115409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11966115409 - 2¹ = 11966115407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11966115407) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8657859 + ... + 8659240.

It is an arithmetic number, because the mean of its divisors is an integer number (2995858300).

Almost surely, 2^11966115409 is an apocalyptic number.

It is an amenable number.

11966115409 is a deficient number, since it is larger than the sum of its proper divisors (17317791).

11966115409 is an equidigital number, since it uses as much as digits as its factorization.

11966115409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17317790.

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 11966115409 in words is "eleven billion, nine hundred sixty-six million, one hundred fifteen thousand, four hundred nine".