77860852068161 has 2 divisors, whose sum is σ = 77860852068162. Its totient is φ = 77860852068160.

The previous prime is 77860852068157. The next prime is 77860852068191. The reversal of 77860852068161 is 16186025806877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42872964585025 + 34987887483136 = 6547745^2 + 5915056^2 .

It is a cyclic number.

It is not a de Polignac number, because 77860852068161 - 2² = 77860852068157 is a prime.

It is not a weakly prime, because it can be changed into another prime (77860852068121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38930426034080 + 38930426034081.

It is an arithmetic number, because the mean of its divisors is an integer number (38930426034081).

Almost surely, 2^{77860852068161} is an apocalyptic number.

It is an amenable number.

77860852068161 is a deficient number, since it is larger than the sum of its proper divisors (1).

77860852068161 is an equidigital number, since it uses as much as digits as its factorization.

77860852068161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54190080, while the sum is 65.

The spelling of 77860852068161 in words is "seventy-seven trillion, eight hundred sixty billion, eight hundred fifty-two million, sixty-eight thousand, one hundred sixty-one".