18445241261 has 2 divisors, whose sum is σ = 18445241262. Its totient is φ = 18445241260.

The previous prime is 18445241231. The next prime is 18445241279. The reversal of 18445241261 is 16214254481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17991125161 + 454116100 = 134131^2 + 21310^2 .

It is an emirp because it is prime and its reverse (16214254481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18445241261 - 2⁶ = 18445241197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18445241231) 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, 9222620630 + 9222620631.

It is an arithmetic number, because the mean of its divisors is an integer number (9222620631).

Almost surely, 2^18445241261 is an apocalyptic number.

It is an amenable number.

18445241261 is a deficient number, since it is larger than the sum of its proper divisors (1).

18445241261 is an equidigital number, since it uses as much as digits as its factorization.

18445241261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 38.

The spelling of 18445241261 in words is "eighteen billion, four hundred forty-five million, two hundred forty-one thousand, two hundred sixty-one".