11664437209 has 2 divisors, whose sum is σ = 11664437210. Its totient is φ = 11664437208.

The previous prime is 11664437179. The next prime is 11664437227. The reversal of 11664437209 is 90273446611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10112313600 + 1552123609 = 100560^2 + 39397^2 .

It is a cyclic number.

It is not a de Polignac number, because 11664437209 - 2¹³ = 11664429017 is a prime.

It is not a weakly prime, because it can be changed into another prime (11664437249) 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, 5832218604 + 5832218605.

It is an arithmetic number, because the mean of its divisors is an integer number (5832218605).

Almost surely, 2^11664437209 is an apocalyptic number.

It is an amenable number.

11664437209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11664437209 is an equidigital number, since it uses as much as digits as its factorization.

11664437209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 11664437209 in words is "eleven billion, six hundred sixty-four million, four hundred thirty-seven thousand, two hundred nine".