6840128888809 has 2 divisors, whose sum is σ = 6840128888810. Its totient is φ = 6840128888808.

The previous prime is 6840128888779. The next prime is 6840128888863. The reversal of 6840128888809 is 9088888210486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6567021264400 + 273107624409 = 2562620^2 + 522597^2 .

It is a cyclic number.

It is not a de Polignac number, because 6840128888809 - 2¹⁹ = 6840128364521 is a prime.

It is not a weakly prime, because it can be changed into another prime (6840128888309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3420064444404 + 3420064444405.

It is an arithmetic number, because the mean of its divisors is an integer number (3420064444405).

Almost surely, 2^{6840128888809} is an apocalyptic number.

It is an amenable number.

6840128888809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6840128888809 is an equidigital number, since it uses as much as digits as its factorization.

6840128888809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113246208, while the sum is 70.

The spelling of 6840128888809 in words is "six trillion, eight hundred forty billion, one hundred twenty-eight million, eight hundred eighty-eight thousand, eight hundred nine".