779116345409 has 2 divisors, whose sum is σ = 779116345410. Its totient is φ = 779116345408.

The previous prime is 779116345367. The next prime is 779116345451. The reversal of 779116345409 is 904543611977.

It is a balanced prime because it is at equal distance from previous prime (779116345367) and next prime (779116345451).

It can be written as a sum of positive squares in only one way, i.e., 582889494784 + 196226850625 = 763472^2 + 442975^2 .

It is an emirp because it is prime and its reverse (904543611977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 779116345409 - 2²⁰ = 779115296833 is a prime.

It is not a weakly prime, because it can be changed into another prime (779116345309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389558172704 + 389558172705.

It is an arithmetic number, because the mean of its divisors is an integer number (389558172705).

Almost surely, 2^779116345409 is an apocalyptic number.

It is an amenable number.

779116345409 is a deficient number, since it is larger than the sum of its proper divisors (1).

779116345409 is an equidigital number, since it uses as much as digits as its factorization.

779116345409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 779116345409 in words is "seven hundred seventy-nine billion, one hundred sixteen million, three hundred forty-five thousand, four hundred nine".