18447385573 has 2 divisors, whose sum is σ = 18447385574. Its totient is φ = 18447385572.

The previous prime is 18447385529. The next prime is 18447385631. The reversal of 18447385573 is 37558374481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16826759524 + 1620626049 = 129718^2 + 40257^2 .

It is a cyclic number.

It is not a de Polignac number, because 18447385573 - 2²⁵ = 18413831141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18447395573) 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, 9223692786 + 9223692787.

It is an arithmetic number, because the mean of its divisors is an integer number (9223692787).

Almost surely, 2^18447385573 is an apocalyptic number.

It is an amenable number.

18447385573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18447385573 is an equidigital number, since it uses as much as digits as its factorization.

18447385573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11289600, while the sum is 55.

The spelling of 18447385573 in words is "eighteen billion, four hundred forty-seven million, three hundred eighty-five thousand, five hundred seventy-three".