7878668713 has 2 divisors, whose sum is σ = 7878668714. Its totient is φ = 7878668712.

The previous prime is 7878668701. The next prime is 7878668783. The reversal of 7878668713 is 3178668787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3995883369 + 3882785344 = 63213^2 + 62312^2 .

It is a cyclic number.

It is not a de Polignac number, because 7878668713 - 2²⁵ = 7845114281 is a prime.

It is not a weakly prime, because it can be changed into another prime (7878668783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939334356 + 3939334357.

It is an arithmetic number, because the mean of its divisors is an integer number (3939334357).

Almost surely, 2^7878668713 is an apocalyptic number.

It is an amenable number.

7878668713 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878668713 is an equidigital number, since it uses as much as digits as its factorization.

7878668713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 61.

The square root of 7878668713 is about 88761.8651955895. The cubic root of 7878668713 is about 1989.8375087646.

The spelling of 7878668713 in words is "seven billion, eight hundred seventy-eight million, six hundred sixty-eight thousand, seven hundred thirteen".