18000043499941 has 2 divisors, whose sum is σ = 18000043499942. Its totient is φ = 18000043499940.

The previous prime is 18000043499923. The next prime is 18000043499969. The reversal of 18000043499941 is 14999434000081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15944608024900 + 2055435475041 = 3993070^2 + 1433679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18000043499941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18000043499341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000021749970 + 9000021749971.

It is an arithmetic number, because the mean of its divisors is an integer number (9000021749971).

Almost surely, 2^{18000043499941} is an apocalyptic number.

It is an amenable number.

18000043499941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000043499941 is an equidigital number, since it uses as much as digits as its factorization.

18000043499941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 18000043499941 in words is "eighteen trillion, forty-three million, four hundred ninety-nine thousand, nine hundred forty-one".