78669296729 has 2 divisors, whose sum is σ = 78669296730. Its totient is φ = 78669296728.

The previous prime is 78669296647. The next prime is 78669296753. The reversal of 78669296729 is 92769296687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58347368704 + 20321928025 = 241552^2 + 142555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78669296729 is a prime.

It is not a weakly prime, because it can be changed into another prime (78669296779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334648364 + 39334648365.

It is an arithmetic number, because the mean of its divisors is an integer number (39334648365).

Almost surely, 2^78669296729 is an apocalyptic number.

It is an amenable number.

78669296729 is a deficient number, since it is larger than the sum of its proper divisors (1).

78669296729 is an equidigital number, since it uses as much as digits as its factorization.

78669296729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246903552, while the sum is 71.

The spelling of 78669296729 in words is "seventy-eight billion, six hundred sixty-nine million, two hundred ninety-six thousand, seven hundred twenty-nine".