18548017592449 has 2 divisors, whose sum is σ = 18548017592450. Its totient is φ = 18548017592448.

The previous prime is 18548017592333. The next prime is 18548017592497. The reversal of 18548017592449 is 94429571084581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18456750161424 + 91267431025 = 4296132^2 + 302105^2 .

It is an emirp because it is prime and its reverse (94429571084581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18548017592449 - 2²⁷ = 18547883374721 is a prime.

It is not a weakly prime, because it can be changed into another prime (18548017592849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9274008796224 + 9274008796225.

It is an arithmetic number, because the mean of its divisors is an integer number (9274008796225).

Almost surely, 2^{18548017592449} is an apocalyptic number.

It is an amenable number.

18548017592449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18548017592449 is an equidigital number, since it uses as much as digits as its factorization.

18548017592449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116121600, while the sum is 67.

The spelling of 18548017592449 in words is "eighteen trillion, five hundred forty-eight billion, seventeen million, five hundred ninety-two thousand, four hundred forty-nine".