18365181941 has 2 divisors, whose sum is σ = 18365181942. Its totient is φ = 18365181940.

The previous prime is 18365181881. The next prime is 18365181943. The reversal of 18365181941 is 14918156381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12631512100 + 5733669841 = 112390^2 + 75721^2 .

It is a cyclic number.

It is not a de Polignac number, because 18365181941 - 2²⁶ = 18298073077 is a prime.

It is a Sophie Germain prime.

Together with 18365181943, it forms a pair of twin primes.

It is a Chen 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 (18365181943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182590970 + 9182590971.

It is an arithmetic number, because the mean of its divisors is an integer number (9182590971).

Almost surely, 2^18365181941 is an apocalyptic number.

It is an amenable number.

18365181941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18365181941 is an equidigital number, since it uses as much as digits as its factorization.

18365181941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 47.

The spelling of 18365181941 in words is "eighteen billion, three hundred sixty-five million, one hundred eighty-one thousand, nine hundred forty-one".