8000000000009 has 2 divisors, whose sum is σ = 8000000000010. Its totient is φ = 8000000000008.

The previous prime is 7999999999993. The next prime is 8000000000131. The reversal of 8000000000009 is 9000000000008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7342040544400 + 657959455609 = 2709620^2 + 811147^2 .

It is a cyclic number.

It is not a de Polignac number, because 8000000000009 - 2⁴ = 7999999999993 is a prime.

8000000000009 is a modest number, since divided by 9 gives 8 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 7999999999897 and 7999999999906.

It is not a weakly prime, because it can be changed into another prime (8000000090009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4000000000004 + 4000000000005.

It is an arithmetic number, because the mean of its divisors is an integer number (4000000000005).

Almost surely, 2^{8000000000009} is an apocalyptic number.

It is an amenable number.

8000000000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8000000000009 is an equidigital number, since it uses as much as digits as its factorization.

8000000000009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Subtracting 8000000000009 from its reverse (9000000000008), we obtain a palindrome (999999999999).

The spelling of 8000000000009 in words is "eight trillion, nine", and thus it is an aban number and an uban number.