77929243361 has 2 divisors, whose sum is σ = 77929243362. Its totient is φ = 77929243360.

The previous prime is 77929243351. The next prime is 77929243393. The reversal of 77929243361 is 16334292977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74887059025 + 3042184336 = 273655^2 + 55156^2 .

It is a cyclic number.

It is not a de Polignac number, because 77929243361 - 2⁶ = 77929243297 is a prime.

It is not a weakly prime, because it can be changed into another prime (77929243321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38964621680 + 38964621681.

It is an arithmetic number, because the mean of its divisors is an integer number (38964621681).

Almost surely, 2^77929243361 is an apocalyptic number.

It is an amenable number.

77929243361 is a deficient number, since it is larger than the sum of its proper divisors (1).

77929243361 is an equidigital number, since it uses as much as digits as its factorization.

77929243361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 53.

The spelling of 77929243361 in words is "seventy-seven billion, nine hundred twenty-nine million, two hundred forty-three thousand, three hundred sixty-one".