18444603052217 has 4 divisors (see below), whose sum is σ = 18538230479076. Its totient is φ = 18350975625360.

The previous prime is 18444603052189. The next prime is 18444603052219. The reversal of 18444603052217 is 71225030644481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15961271464336 + 2483331587881 = 3995156^2 + 1575859^2 .

It is a cyclic number.

It is not a de Polignac number, because 18444603052217 - 2³² = 18440308084921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18444603052219) 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, 46813713134 + ... + 46813713527.

It is an arithmetic number, because the mean of its divisors is an integer number (4634557619769).

Almost surely, 2^{18444603052217} is an apocalyptic number.

It is an amenable number.

18444603052217 is a deficient number, since it is larger than the sum of its proper divisors (93627426859).

18444603052217 is an equidigital number, since it uses as much as digits as its factorization.

18444603052217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93627426858.

The product of its (nonzero) digits is 1290240, while the sum is 47.

Adding to 18444603052217 its reverse (71225030644481), we get a palindrome (89669633696698).

The spelling of 18444603052217 in words is "eighteen trillion, four hundred forty-four billion, six hundred three million, fifty-two thousand, two hundred seventeen".