778661713 has 2 divisors, whose sum is σ = 778661714. Its totient is φ = 778661712.

The previous prime is 778661699. The next prime is 778661729. The reversal of 778661713 is 317166877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673558209 + 105103504 = 25953^2 + 10252^2 .

It is a cyclic number.

It is not a de Polignac number, because 778661713 - 2⁹ = 778661201 is a prime.

It is not a weakly prime, because it can be changed into another prime (778661783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389330856 + 389330857.

It is an arithmetic number, because the mean of its divisors is an integer number (389330857).

Almost surely, 2^778661713 is an apocalyptic number.

It is an amenable number.

778661713 is a deficient number, since it is larger than the sum of its proper divisors (1).

778661713 is an equidigital number, since it uses as much as digits as its factorization.

778661713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 46.

The square root of 778661713 is about 27904.5106210448. The cubic root of 778661713 is about 919.9896474103.

The spelling of 778661713 in words is "seven hundred seventy-eight million, six hundred sixty-one thousand, seven hundred thirteen".