77717409347779 has 2 divisors, whose sum is σ = 77717409347780. Its totient is φ = 77717409347778.

The previous prime is 77717409347729. The next prime is 77717409347791. The reversal of 77717409347779 is 97774390471777.

It is a strong prime.

It is an emirp because it is prime and its reverse (97774390471777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77717409347779 - 2⁷ = 77717409347651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77717409347699 and 77717409347708.

It is not a weakly prime, because it can be changed into another prime (77717409347729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38858704673889 + 38858704673890.

It is an arithmetic number, because the mean of its divisors is an integer number (38858704673890).

Almost surely, 2^{77717409347779} is an apocalyptic number.

77717409347779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77717409347779 is an equidigital number, since it uses as much as digits as its factorization.

77717409347779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3201935184, while the sum is 79.

The spelling of 77717409347779 in words is "seventy-seven trillion, seven hundred seventeen billion, four hundred nine million, three hundred forty-seven thousand, seven hundred seventy-nine".