18418961573737 has 2 divisors, whose sum is σ = 18418961573738. Its totient is φ = 18418961573736.

The previous prime is 18418961573729. The next prime is 18418961573759. The reversal of 18418961573737 is 73737516981481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17989312787161 + 429648786576 = 4241381^2 + 655476^2 .

It is an emirp because it is prime and its reverse (73737516981481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18418961573737 - 2³ = 18418961573729 is a prime.

It is not a weakly prime, because it can be changed into another prime (18418961571737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209480786868 + 9209480786869.

It is an arithmetic number, because the mean of its divisors is an integer number (9209480786869).

Almost surely, 2^{18418961573737} is an apocalyptic number.

It is an amenable number.

18418961573737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418961573737 is an equidigital number, since it uses as much as digits as its factorization.

18418961573737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 213373440, while the sum is 70.

The spelling of 18418961573737 in words is "eighteen trillion, four hundred eighteen billion, nine hundred sixty-one million, five hundred seventy-three thousand, seven hundred thirty-seven".