18000018000073 has 2 divisors, whose sum is σ = 18000018000074. Its totient is φ = 18000018000072.

The previous prime is 18000018000043. The next prime is 18000018000077. The reversal of 18000018000073 is 37000081000081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9152028653824 + 8847989346249 = 3025232^2 + 2974557^2 .

It is a cyclic number.

It is not a de Polignac number, because 18000018000073 - 2¹³ = 18000017991881 is a prime.

It is not a weakly prime, because it can be changed into another prime (18000018000077) 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, 9000009000036 + 9000009000037.

It is an arithmetic number, because the mean of its divisors is an integer number (9000009000037).

Almost surely, 2^{18000018000073} is an apocalyptic number.

It is an amenable number.

18000018000073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000018000073 is an equidigital number, since it uses as much as digits as its factorization.

18000018000073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The spelling of 18000018000073 in words is "eighteen trillion, eighteen million, seventy-three", and thus it is an aban number and an uban number.