18328078081 has 2 divisors, whose sum is σ = 18328078082. Its totient is φ = 18328078080.

The previous prime is 18328078079. The next prime is 18328078127. The reversal of 18328078081 is 18087082381.

It is a happy number.

It is an a-pointer prime, because the next prime (18328078127) can be obtained adding 18328078081 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13999622400 + 4328455681 = 118320^2 + 65791^2 .

It is a cyclic number.

It is not a de Polignac number, because 18328078081 - 2¹ = 18328078079 is a prime.

It is a super-2 number, since 2×18328078081² (a number of 21 digits) contains 22 as substring.

Together with 18328078079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18328078031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164039040 + 9164039041.

It is an arithmetic number, because the mean of its divisors is an integer number (9164039041).

Almost surely, 2^18328078081 is an apocalyptic number.

It is an amenable number.

18328078081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328078081 is an equidigital number, since it uses as much as digits as its factorization.

18328078081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172032, while the sum is 46.

The spelling of 18328078081 in words is "eighteen billion, three hundred twenty-eight million, seventy-eight thousand, eighty-one".