18462804393821 has 2 divisors, whose sum is σ = 18462804393822. Its totient is φ = 18462804393820.

The previous prime is 18462804393797. The next prime is 18462804393827. The reversal of 18462804393821 is 12839340826481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10567772157721 + 7895032236100 = 3250811^2 + 2809810^2 .

It is a cyclic number.

It is not a de Polignac number, because 18462804393821 - 2¹⁰ = 18462804392797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18462804393827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9231402196910 + 9231402196911.

It is an arithmetic number, because the mean of its divisors is an integer number (9231402196911).

Almost surely, 2^{18462804393821} is an apocalyptic number.

It is an amenable number.

18462804393821 is a deficient number, since it is larger than the sum of its proper divisors (1).

18462804393821 is an equidigital number, since it uses as much as digits as its factorization.

18462804393821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15925248, while the sum is 59.

The spelling of 18462804393821 in words is "eighteen trillion, four hundred sixty-two billion, eight hundred four million, three hundred ninety-three thousand, eight hundred twenty-one".