18424395181 has 2 divisors, whose sum is σ = 18424395182. Its totient is φ = 18424395180.

The previous prime is 18424395179. The next prime is 18424395221. The reversal of 18424395181 is 18159342481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17602655625 + 821739556 = 132675^2 + 28666^2 .

It is a cyclic number.

It is not a de Polignac number, because 18424395181 - 2¹ = 18424395179 is a prime.

It is a super-2 number, since 2×18424395181² (a number of 21 digits) contains 22 as substring.

Together with 18424395179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18424395161) 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, 9212197590 + 9212197591.

It is an arithmetic number, because the mean of its divisors is an integer number (9212197591).

Almost surely, 2^18424395181 is an apocalyptic number.

It is an amenable number.

18424395181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18424395181 is an equidigital number, since it uses as much as digits as its factorization.

18424395181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The spelling of 18424395181 in words is "eighteen billion, four hundred twenty-four million, three hundred ninety-five thousand, one hundred eighty-one".