77807967089 has 2 divisors, whose sum is σ = 77807967090. Its totient is φ = 77807967088.

The previous prime is 77807967049. The next prime is 77807967091. The reversal of 77807967089 is 98076970877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77350734400 + 457232689 = 278120^2 + 21383^2 .

It is a cyclic number.

It is not a de Polignac number, because 77807967089 - 2¹⁶ = 77807901553 is a prime.

It is a Sophie Germain prime.

Together with 77807967091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77807967019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38903983544 + 38903983545.

It is an arithmetic number, because the mean of its divisors is an integer number (38903983545).

Almost surely, 2^77807967089 is an apocalyptic number.

It is an amenable number.

77807967089 is a deficient number, since it is larger than the sum of its proper divisors (1).

77807967089 is an equidigital number, since it uses as much as digits as its factorization.

77807967089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74680704, while the sum is 68.

The spelling of 77807967089 in words is "seventy-seven billion, eight hundred seven million, nine hundred sixty-seven thousand, eighty-nine".