18450471181 has 2 divisors, whose sum is σ = 18450471182. Its totient is φ = 18450471180.

The previous prime is 18450471173. The next prime is 18450471239. The reversal of 18450471181 is 18117405481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16965062500 + 1485408681 = 130250^2 + 38541^2 .

It is a cyclic number.

It is not a de Polignac number, because 18450471181 - 2³ = 18450471173 is a prime.

It is a super-2 number, since 2×18450471181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18450474181) 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, 9225235590 + 9225235591.

It is an arithmetic number, because the mean of its divisors is an integer number (9225235591).

Almost surely, 2^18450471181 is an apocalyptic number.

It is an amenable number.

18450471181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18450471181 is an equidigital number, since it uses as much as digits as its factorization.

18450471181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35840, while the sum is 40.

The spelling of 18450471181 in words is "eighteen billion, four hundred fifty million, four hundred seventy-one thousand, one hundred eighty-one".