18454944665233 has 2 divisors, whose sum is σ = 18454944665234. Its totient is φ = 18454944665232.

The previous prime is 18454944665081. The next prime is 18454944665237. The reversal of 18454944665233 is 33256644945481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15020027322624 + 3434917342609 = 3875568^2 + 1853353^2 .

It is a cyclic number.

It is not a de Polignac number, because 18454944665233 - 2¹³ = 18454944657041 is a prime.

It is not a weakly prime, because it can be changed into another prime (18454944665237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227472332616 + 9227472332617.

It is an arithmetic number, because the mean of its divisors is an integer number (9227472332617).

Almost surely, 2^{18454944665233} is an apocalyptic number.

It is an amenable number.

18454944665233 is a deficient number, since it is larger than the sum of its proper divisors (1).

18454944665233 is an equidigital number, since it uses as much as digits as its factorization.

18454944665233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 298598400, while the sum is 64.

The spelling of 18454944665233 in words is "eighteen trillion, four hundred fifty-four billion, nine hundred forty-four million, six hundred sixty-five thousand, two hundred thirty-three".