84108776238689 has 2 divisors, whose sum is σ = 84108776238690. Its totient is φ = 84108776238688.

The previous prime is 84108776238659. The next prime is 84108776238691. The reversal of 84108776238689 is 98683267780148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62627961371089 + 21480814867600 = 7913783^2 + 4634740^2 .

It is a cyclic number.

It is not a de Polignac number, because 84108776238689 - 2⁴⁴ = 66516590194273 is a prime.

It is a Sophie Germain prime.

Together with 84108776238691, 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 (84108776238659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42054388119344 + 42054388119345.

It is an arithmetic number, because the mean of its divisors is an integer number (42054388119345).

Almost surely, 2^{84108776238689} is an apocalyptic number.

It is an amenable number.

84108776238689 is a deficient number, since it is larger than the sum of its proper divisors (1).

84108776238689 is an equidigital number, since it uses as much as digits as its factorization.

84108776238689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1560674304, while the sum is 77.

The spelling of 84108776238689 in words is "eighty-four trillion, one hundred eight billion, seven hundred seventy-six million, two hundred thirty-eight thousand, six hundred eighty-nine".