77798000909 has 2 divisors, whose sum is σ = 77798000910. Its totient is φ = 77798000908.

The previous prime is 77798000879. The next prime is 77798000911. The reversal of 77798000909 is 90900089777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72022456900 + 5775544009 = 268370^2 + 75997^2 .

It is a cyclic number.

It is not a de Polignac number, because 77798000909 - 2³⁶ = 9078524173 is a prime.

Together with 77798000911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77798000939) 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, 38899000454 + 38899000455.

It is an arithmetic number, because the mean of its divisors is an integer number (38899000455).

Almost surely, 2^77798000909 is an apocalyptic number.

It is an amenable number.

77798000909 is a deficient number, since it is larger than the sum of its proper divisors (1).

77798000909 is an equidigital number, since it uses as much as digits as its factorization.

77798000909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The spelling of 77798000909 in words is "seventy-seven billion, seven hundred ninety-eight million, nine hundred nine", and thus it is an aban number.