779116842209 has 2 divisors, whose sum is σ = 779116842210. Its totient is φ = 779116842208.

The previous prime is 779116842173. The next prime is 779116842289. The reversal of 779116842209 is 902248611977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742919877184 + 36196965025 = 861928^2 + 190255^2 .

It is a cyclic number.

It is not a de Polignac number, because 779116842209 - 2¹² = 779116838113 is a prime.

It is not a weakly prime, because it can be changed into another prime (779116842289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389558421104 + 389558421105.

It is an arithmetic number, because the mean of its divisors is an integer number (389558421105).

Almost surely, 2^779116842209 is an apocalyptic number.

It is an amenable number.

779116842209 is a deficient number, since it is larger than the sum of its proper divisors (1).

779116842209 is an equidigital number, since it uses as much as digits as its factorization.

779116842209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 779116842209 in words is "seven hundred seventy-nine billion, one hundred sixteen million, eight hundred forty-two thousand, two hundred nine".