18550855249 has 2 divisors, whose sum is σ = 18550855250. Its totient is φ = 18550855248.

The previous prime is 18550855247. The next prime is 18550855291. The reversal of 18550855249 is 94255805581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16288140625 + 2262714624 = 127625^2 + 47568^2 .

It is a cyclic number.

It is not a de Polignac number, because 18550855249 - 2¹ = 18550855247 is a prime.

Together with 18550855247, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18550855196 and 18550855205.

It is not a weakly prime, because it can be changed into another prime (18550855247) 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, 9275427624 + 9275427625.

It is an arithmetic number, because the mean of its divisors is an integer number (9275427625).

Almost surely, 2^18550855249 is an apocalyptic number.

It is an amenable number.

18550855249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18550855249 is an equidigital number, since it uses as much as digits as its factorization.

18550855249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880000, while the sum is 52.

The spelling of 18550855249 in words is "eighteen billion, five hundred fifty million, eight hundred fifty-five thousand, two hundred forty-nine".