18501853350049 has 2 divisors, whose sum is σ = 18501853350050. Its totient is φ = 18501853350048.

The previous prime is 18501853350011. The next prime is 18501853350119. The reversal of 18501853350049 is 94005335810581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12180148860049 + 6321704490000 = 3490007^2 + 2514300^2 .

It is a cyclic number.

It is not a de Polignac number, because 18501853350049 - 2³¹ = 18499705866401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18501853349978 and 18501853350005.

It is not a weakly prime, because it can be changed into another prime (18501853350649) 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, 9250926675024 + 9250926675025.

It is an arithmetic number, because the mean of its divisors is an integer number (9250926675025).

Almost surely, 2^{18501853350049} is an apocalyptic number.

It is an amenable number.

18501853350049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18501853350049 is an equidigital number, since it uses as much as digits as its factorization.

18501853350049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 52.

The spelling of 18501853350049 in words is "eighteen trillion, five hundred one billion, eight hundred fifty-three million, three hundred fifty thousand, forty-nine".