18061143805321 has 2 divisors, whose sum is σ = 18061143805322. Its totient is φ = 18061143805320.

The previous prime is 18061143805261. The next prime is 18061143805343. The reversal of 18061143805321 is 12350834116081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12939811868025 + 5121331937296 = 3597195^2 + 2263036^2 .

It is a cyclic number.

It is not a de Polignac number, because 18061143805321 - 2⁴³ = 9265050783113 is a prime.

It is not a weakly prime, because it can be changed into another prime (18061143805361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9030571902660 + 9030571902661.

It is an arithmetic number, because the mean of its divisors is an integer number (9030571902661).

Almost surely, 2^{18061143805321} is an apocalyptic number.

It is an amenable number.

18061143805321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061143805321 is an equidigital number, since it uses as much as digits as its factorization.

18061143805321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 18061143805321 in words is "eighteen trillion, sixty-one billion, one hundred forty-three million, eight hundred five thousand, three hundred twenty-one".