7779313664609 has 2 divisors, whose sum is σ = 7779313664610. Its totient is φ = 7779313664608.

The previous prime is 7779313664597. The next prime is 7779313664701. The reversal of 7779313664609 is 9064663139777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6803620140625 + 975693523984 = 2608375^2 + 987772^2 .

It is a cyclic number.

It is not a de Polignac number, because 7779313664609 - 2¹⁶ = 7779313599073 is a prime.

It is not a weakly prime, because it can be changed into another prime (7779313604609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889656832304 + 3889656832305.

It is an arithmetic number, because the mean of its divisors is an integer number (3889656832305).

Almost surely, 2^{7779313664609} is an apocalyptic number.

It is an amenable number.

7779313664609 is a deficient number, since it is larger than the sum of its proper divisors (1).

7779313664609 is an equidigital number, since it uses as much as digits as its factorization.

7779313664609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216040608, while the sum is 68.

The spelling of 7779313664609 in words is "seven trillion, seven hundred seventy-nine billion, three hundred thirteen million, six hundred sixty-four thousand, six hundred nine".