777120068509 has 2 divisors, whose sum is σ = 777120068510. Its totient is φ = 777120068508.

The previous prime is 777120068497. The next prime is 777120068513. The reversal of 777120068509 is 905860021777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755991992484 + 21128076025 = 869478^2 + 145355^2 .

It is an emirp because it is prime and its reverse (905860021777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 777120068509 - 2⁵ = 777120068477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (777120078509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388560034254 + 388560034255.

It is an arithmetic number, because the mean of its divisors is an integer number (388560034255).

Almost surely, 2^777120068509 is an apocalyptic number.

It is an amenable number.

777120068509 is a deficient number, since it is larger than the sum of its proper divisors (1).

777120068509 is an equidigital number, since it uses as much as digits as its factorization.

777120068509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 777120068509 in words is "seven hundred seventy-seven billion, one hundred twenty million, sixty-eight thousand, five hundred nine".