77038197779 has 2 divisors, whose sum is σ = 77038197780. Its totient is φ = 77038197778.

The previous prime is 77038197763. The next prime is 77038197787. The reversal of 77038197779 is 97779183077.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77038197779 - 2⁴ = 77038197763 is a prime.

It is not a weakly prime, because it can be changed into another prime (77038197739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38519098889 + 38519098890.

It is an arithmetic number, because the mean of its divisors is an integer number (38519098890).

Almost surely, 2^77038197779 is an apocalyptic number.

77038197779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77038197779 is an equidigital number, since it uses as much as digits as its factorization.

77038197779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32672808, while the sum is 65.

The spelling of 77038197779 in words is "seventy-seven billion, thirty-eight million, one hundred ninety-seven thousand, seven hundred seventy-nine".