77327798497 has 2 divisors, whose sum is σ = 77327798498. Its totient is φ = 77327798496.

The previous prime is 77327798491. The next prime is 77327798539. The reversal of 77327798497 is 79489772377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44493996096 + 32833802401 = 210936^2 + 181201^2 .

It is a cyclic number.

It is not a de Polignac number, because 77327798497 - 2⁷ = 77327798369 is a prime.

It is not a weakly prime, because it can be changed into another prime (77327798491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38663899248 + 38663899249.

It is an arithmetic number, because the mean of its divisors is an integer number (38663899249).

Almost surely, 2^77327798497 is an apocalyptic number.

It is an amenable number.

77327798497 is a deficient number, since it is larger than the sum of its proper divisors (1).

77327798497 is an equidigital number, since it uses as much as digits as its factorization.

77327798497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 261382464, while the sum is 70.

The spelling of 77327798497 in words is "seventy-seven billion, three hundred twenty-seven million, seven hundred ninety-eight thousand, four hundred ninety-seven".