18445572113 has 2 divisors, whose sum is σ = 18445572114. Its totient is φ = 18445572112.

The previous prime is 18445572073. The next prime is 18445572121. The reversal of 18445572113 is 31127554481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15005515009 + 3440057104 = 122497^2 + 58652^2 .

It is an emirp because it is prime and its reverse (31127554481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18445572113 - 2¹² = 18445568017 is a prime.

It is not a weakly prime, because it can be changed into another prime (18445572163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9222786056 + 9222786057.

It is an arithmetic number, because the mean of its divisors is an integer number (9222786057).

Almost surely, 2^18445572113 is an apocalyptic number.

It is an amenable number.

18445572113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18445572113 is an equidigital number, since it uses as much as digits as its factorization.

18445572113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 41.

The spelling of 18445572113 in words is "eighteen billion, four hundred forty-five million, five hundred seventy-two thousand, one hundred thirteen".