17668254449 has 4 divisors (see below), whose sum is σ = 17672069364. Its totient is φ = 17664439536.

The previous prime is 17668254407. The next prime is 17668254473. The reversal of 17668254449 is 94445286671.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94445286671 = 607 ⋅155593553.

It can be written as a sum of positive squares in 2 ways, for example, as 5070436849 + 12597817600 = 71207^2 + 112240^2 .

It is a cyclic number.

It is not a de Polignac number, because 17668254449 - 2⁸ = 17668254193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17668254394 and 17668254403.

It is not an unprimeable number, because it can be changed into a prime (17668254949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1900502 + ... + 1909775.

It is an arithmetic number, because the mean of its divisors is an integer number (4418017341).

Almost surely, 2^17668254449 is an apocalyptic number.

It is an amenable number.

17668254449 is a deficient number, since it is larger than the sum of its proper divisors (3814915).

17668254449 is an equidigital number, since it uses as much as digits as its factorization.

17668254449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814914.

The product of its digits is 11612160, while the sum is 56.

The spelling of 17668254449 in words is "seventeen billion, six hundred sixty-eight million, two hundred fifty-four thousand, four hundred forty-nine".