18318363634177 has 2 divisors, whose sum is σ = 18318363634178. Its totient is φ = 18318363634176.

The previous prime is 18318363634121. The next prime is 18318363634183. The reversal of 18318363634177 is 77143636381381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15963093307456 + 2355270326721 = 3995384^2 + 1534689^2 .

It is a cyclic number.

It is not a de Polignac number, because 18318363634177 - 2¹⁹ = 18318363109889 is a prime.

It is not a weakly prime, because it can be changed into another prime (18318363644177) 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, 9159181817088 + 9159181817089.

It is an arithmetic number, because the mean of its divisors is an integer number (9159181817089).

Almost surely, 2^{18318363634177} is an apocalyptic number.

It is an amenable number.

18318363634177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318363634177 is an equidigital number, since it uses as much as digits as its factorization.

18318363634177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36578304, while the sum is 61.

The spelling of 18318363634177 in words is "eighteen trillion, three hundred eighteen billion, three hundred sixty-three million, six hundred thirty-four thousand, one hundred seventy-seven".