11648436809 has 2 divisors, whose sum is σ = 11648436810. Its totient is φ = 11648436808.

The previous prime is 11648436773. The next prime is 11648436817. The reversal of 11648436809 is 90863484611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6964403209 + 4684033600 = 83453^2 + 68440^2 .

It is an emirp because it is prime and its reverse (90863484611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11648436809 is a prime.

It is a super-2 number, since 2×11648436809² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11648436859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5824218404 + 5824218405.

It is an arithmetic number, because the mean of its divisors is an integer number (5824218405).

Almost surely, 2^11648436809 is an apocalyptic number.

It is an amenable number.

11648436809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11648436809 is an equidigital number, since it uses as much as digits as its factorization.

11648436809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 11648436809 in words is "eleven billion, six hundred forty-eight million, four hundred thirty-six thousand, eight hundred nine".