18321667287541 has 2 divisors, whose sum is σ = 18321667287542. Its totient is φ = 18321667287540.

The previous prime is 18321667287463. The next prime is 18321667287587. The reversal of 18321667287541 is 14578276612381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16526257562500 + 1795409725041 = 4065250^2 + 1339929^2 .

It is a cyclic number.

It is not a de Polignac number, because 18321667287541 - 2³⁹ = 17771911473653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18321667287541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18321667287641) 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, 9160833643770 + 9160833643771.

It is an arithmetic number, because the mean of its divisors is an integer number (9160833643771).

Almost surely, 2^{18321667287541} is an apocalyptic number.

It is an amenable number.

18321667287541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18321667287541 is an equidigital number, since it uses as much as digits as its factorization.

18321667287541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 61.

The spelling of 18321667287541 in words is "eighteen trillion, three hundred twenty-one billion, six hundred sixty-seven million, two hundred eighty-seven thousand, five hundred forty-one".