11691664357 has 2 divisors, whose sum is σ = 11691664358. Its totient is φ = 11691664356.

The previous prime is 11691664321. The next prime is 11691664403. The reversal of 11691664357 is 75346619611.

It is a happy number.

11691664357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11652338916 + 39325441 = 107946^2 + 6271^2 .

It is a cyclic number.

It is not a de Polignac number, because 11691664357 - 2¹¹ = 11691662309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11691664357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11691664657) 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, 5845832178 + 5845832179.

It is an arithmetic number, because the mean of its divisors is an integer number (5845832179).

Almost surely, 2^11691664357 is an apocalyptic number.

It is an amenable number.

11691664357 is a deficient number, since it is larger than the sum of its proper divisors (1).

11691664357 is an equidigital number, since it uses as much as digits as its factorization.

11691664357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The spelling of 11691664357 in words is "eleven billion, six hundred ninety-one million, six hundred sixty-four thousand, three hundred fifty-seven".