78668886679 has 2 divisors, whose sum is σ = 78668886680. Its totient is φ = 78668886678.

The previous prime is 78668886649. The next prime is 78668886689. The reversal of 78668886679 is 97668886687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78668886679 - 2¹⁹ = 78668362391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78668886599 and 78668886608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78668886649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334443339 + 39334443340.

It is an arithmetic number, because the mean of its divisors is an integer number (39334443340).

Almost surely, 2^78668886679 is an apocalyptic number.

78668886679 is a deficient number, since it is larger than the sum of its proper divisors (1).

78668886679 is an equidigital number, since it uses as much as digits as its factorization.

78668886679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2341011456, while the sum is 79.

The spelling of 78668886679 in words is "seventy-eight billion, six hundred sixty-eight million, eight hundred eighty-six thousand, six hundred seventy-nine".