18318128077049 has 2 divisors, whose sum is σ = 18318128077050. Its totient is φ = 18318128077048.

The previous prime is 18318128077003. The next prime is 18318128077141. The reversal of 18318128077049 is 94077082181381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17104510777600 + 1213617299449 = 4135760^2 + 1101643^2 .

It is a cyclic number.

It is not a de Polignac number, because 18318128077049 - 2²⁴ = 18318111299833 is a prime.

It is not a weakly prime, because it can be changed into another prime (18318128077649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159064038524 + 9159064038525.

It is an arithmetic number, because the mean of its divisors is an integer number (9159064038525).

Almost surely, 2^{18318128077049} is an apocalyptic number.

It is an amenable number.

18318128077049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318128077049 is an equidigital number, since it uses as much as digits as its factorization.

18318128077049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 18318128077049 in words is "eighteen trillion, three hundred eighteen billion, one hundred twenty-eight million, seventy-seven thousand, forty-nine".