2780326563709 has 2 divisors, whose sum is σ = 2780326563710. Its totient is φ = 2780326563708.

The previous prime is 2780326563671. The next prime is 2780326563713. The reversal of 2780326563709 is 9073656230872.

2780326563709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2774773035225 + 5553528484 = 1665765^2 + 74522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780326563709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780326563799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390163281854 + 1390163281855.

It is an arithmetic number, because the mean of its divisors is an integer number (1390163281855).

Almost surely, 2^{2780326563709} is an apocalyptic number.

It is an amenable number.

2780326563709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780326563709 is an equidigital number, since it uses as much as digits as its factorization.

2780326563709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22861440, while the sum is 58.

The spelling of 2780326563709 in words is "two trillion, seven hundred eighty billion, three hundred twenty-six million, five hundred sixty-three thousand, seven hundred nine".