18318823177 has 2 divisors, whose sum is σ = 18318823178. Its totient is φ = 18318823176.

The previous prime is 18318823151. The next prime is 18318823199. The reversal of 18318823177 is 77132881381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15002330256 + 3316492921 = 122484^2 + 57589^2 .

It is a cyclic number.

It is not a de Polignac number, because 18318823177 - 2⁷ = 18318823049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18318823177.

It is not a weakly prime, because it can be changed into another prime (18318823277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159411588 + 9159411589.

It is an arithmetic number, because the mean of its divisors is an integer number (9159411589).

Almost surely, 2^18318823177 is an apocalyptic number.

It is an amenable number.

18318823177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318823177 is an equidigital number, since it uses as much as digits as its factorization.

18318823177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 49.

The spelling of 18318823177 in words is "eighteen billion, three hundred eighteen million, eight hundred twenty-three thousand, one hundred seventy-seven".