11990665391 has 2 divisors, whose sum is σ = 11990665392. Its totient is φ = 11990665390.

The previous prime is 11990665327. The next prime is 11990665397. The reversal of 11990665391 is 19356609911.

11990665391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11990665391 - 2⁶ = 11990665327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11990665397) 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 as a sum of consecutive naturals, namely, 5995332695 + 5995332696.

It is an arithmetic number, because the mean of its divisors is an integer number (5995332696).

Almost surely, 2^11990665391 is an apocalyptic number.

11990665391 is a deficient number, since it is larger than the sum of its proper divisors (1).

11990665391 is an equidigital number, since it uses as much as digits as its factorization.

11990665391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393660, while the sum is 50.

The spelling of 11990665391 in words is "eleven billion, nine hundred ninety million, six hundred sixty-five thousand, three hundred ninety-one".