77815535117 has 2 divisors, whose sum is σ = 77815535118. Its totient is φ = 77815535116.

The previous prime is 77815535071. The next prime is 77815535137. The reversal of 77815535117 is 71153551877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60923074276 + 16892460841 = 246826^2 + 129971^2 .

It is a cyclic number.

It is not a de Polignac number, because 77815535117 - 2¹⁶ = 77815469581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77815535137) 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, 38907767558 + 38907767559.

It is an arithmetic number, because the mean of its divisors is an integer number (38907767559).

Almost surely, 2^77815535117 is an apocalyptic number.

It is an amenable number.

77815535117 is a deficient number, since it is larger than the sum of its proper divisors (1).

77815535117 is an equidigital number, since it uses as much as digits as its factorization.

77815535117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1029000, while the sum is 50.

The spelling of 77815535117 in words is "seventy-seven billion, eight hundred fifteen million, five hundred thirty-five thousand, one hundred seventeen".