18004390146881 has 2 divisors, whose sum is σ = 18004390146882. Its totient is φ = 18004390146880.

The previous prime is 18004390146859. The next prime is 18004390146887. The reversal of 18004390146881 is 18864109340081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18000460863025 + 3929283856 = 4242695^2 + 62684^2 .

It is a cyclic number.

It is not a de Polignac number, because 18004390146881 - 2⁶ = 18004390146817 is a prime.

It is a super-2 number, since 2×18004390146881² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18004390146887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9002195073440 + 9002195073441.

It is an arithmetic number, because the mean of its divisors is an integer number (9002195073441).

Almost surely, 2^{18004390146881} is an apocalyptic number.

It is an amenable number.

18004390146881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18004390146881 is an equidigital number, since it uses as much as digits as its factorization.

18004390146881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 18004390146881 in words is "eighteen trillion, four billion, three hundred ninety million, one hundred forty-six thousand, eight hundred eighty-one".