11687066509 has 2 divisors, whose sum is σ = 11687066510. Its totient is φ = 11687066508.

The previous prime is 11687066477. The next prime is 11687066561. The reversal of 11687066509 is 90566078611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9970621609 + 1716444900 = 99853^2 + 41430^2 .

It is a cyclic number.

It is not a de Polignac number, because 11687066509 - 2⁵ = 11687066477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11687066579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5843533254 + 5843533255.

It is an arithmetic number, because the mean of its divisors is an integer number (5843533255).

Almost surely, 2^11687066509 is an apocalyptic number.

It is an amenable number.

11687066509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11687066509 is an equidigital number, since it uses as much as digits as its factorization.

11687066509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 11687066509 in words is "eleven billion, six hundred eighty-seven million, sixty-six thousand, five hundred nine".