7678945709 has 2 divisors, whose sum is σ = 7678945710. Its totient is φ = 7678945708.

The previous prime is 7678945697. The next prime is 7678945717. The reversal of 7678945709 is 9075498767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7675512100 + 3433609 = 87610^2 + 1853^2 .

It is a cyclic number.

It is not a de Polignac number, because 7678945709 - 2²⁰ = 7677897133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7678941709) 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, 3839472854 + 3839472855.

It is an arithmetic number, because the mean of its divisors is an integer number (3839472855).

Almost surely, 2^7678945709 is an apocalyptic number.

It is an amenable number.

7678945709 is a deficient number, since it is larger than the sum of its proper divisors (1).

7678945709 is an equidigital number, since it uses as much as digits as its factorization.

7678945709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26671680, while the sum is 62.

The square root of 7678945709 is about 87629.5937968447. The cubic root of 7678945709 is about 1972.8793739025.

The spelling of 7678945709 in words is "seven billion, six hundred seventy-eight million, nine hundred forty-five thousand, seven hundred nine".