779838208969 has 2 divisors, whose sum is σ = 779838208970. Its totient is φ = 779838208968.

The previous prime is 779838208871. The next prime is 779838208973. The reversal of 779838208969 is 969802838977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 747541806025 + 32296402944 = 864605^2 + 179712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-779838208969 is a prime.

It is a super-2 number, since 2×779838208969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 779838208895 and 779838208904.

It is not a weakly prime, because it can be changed into another prime (779838208069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389919104484 + 389919104485.

It is an arithmetic number, because the mean of its divisors is an integer number (389919104485).

Almost surely, 2^779838208969 is an apocalyptic number.

It is an amenable number.

779838208969 is a deficient number, since it is larger than the sum of its proper divisors (1).

779838208969 is an equidigital number, since it uses as much as digits as its factorization.

779838208969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 658409472, while the sum is 76.

The spelling of 779838208969 in words is "seven hundred seventy-nine billion, eight hundred thirty-eight million, two hundred eight thousand, nine hundred sixty-nine".