18163912177 has 2 divisors, whose sum is σ = 18163912178. Its totient is φ = 18163912176.

The previous prime is 18163912141. The next prime is 18163912187. The reversal of 18163912177 is 77121936181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12516239376 + 5647672801 = 111876^2 + 75151^2 .

It is an emirp because it is prime and its reverse (77121936181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18163912177 is a prime.

It is a super-3 number, since 3×18163912177³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18163912187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9081956088 + 9081956089.

It is an arithmetic number, because the mean of its divisors is an integer number (9081956089).

Almost surely, 2^18163912177 is an apocalyptic number.

It is an amenable number.

18163912177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18163912177 is an equidigital number, since it uses as much as digits as its factorization.

18163912177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 46.

The spelling of 18163912177 in words is "eighteen billion, one hundred sixty-three million, nine hundred twelve thousand, one hundred seventy-seven".