18885986331281 has 2 divisors, whose sum is σ = 18885986331282. Its totient is φ = 18885986331280.

The previous prime is 18885986331271. The next prime is 18885986331347. The reversal of 18885986331281 is 18213368958881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18856611456400 + 29374874881 = 4342420^2 + 171391^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885986331281 - 2²² = 18885982136977 is a prime.

It is a super-2 number, since 2×18885986331281² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18885986331271) 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, 9442993165640 + 9442993165641.

It is an arithmetic number, because the mean of its divisors is an integer number (9442993165641).

Almost surely, 2^{18885986331281} is an apocalyptic number.

It is an amenable number.

18885986331281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885986331281 is an equidigital number, since it uses as much as digits as its factorization.

18885986331281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 159252480, while the sum is 71.

The spelling of 18885986331281 in words is "eighteen trillion, eight hundred eighty-five billion, nine hundred eighty-six million, three hundred thirty-one thousand, two hundred eighty-one".