18328863121 has 2 divisors, whose sum is σ = 18328863122. Its totient is φ = 18328863120.

The previous prime is 18328863101. The next prime is 18328863221. The reversal of 18328863121 is 12136882381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13507088400 + 4821774721 = 116220^2 + 69439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18328863121 is a prime.

It is not a weakly prime, because it can be changed into another prime (18328863101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164431560 + 9164431561.

It is an arithmetic number, because the mean of its divisors is an integer number (9164431561).

Almost surely, 2^18328863121 is an apocalyptic number.

It is an amenable number.

18328863121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328863121 is an equidigital number, since it uses as much as digits as its factorization.

18328863121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 43.

The spelling of 18328863121 in words is "eighteen billion, three hundred twenty-eight million, eight hundred sixty-three thousand, one hundred twenty-one".