18844851632081 has 2 divisors, whose sum is σ = 18844851632082. Its totient is φ = 18844851632080.

The previous prime is 18844851632071. The next prime is 18844851632141. The reversal of 18844851632081 is 18023615844881.

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., 15536872755856 + 3307978876225 = 3941684^2 + 1818785^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844851632081 - 2⁶ = 18844851632017 is a prime.

It is a super-2 number, since 2×18844851632081² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18844851632081.

It is not a weakly prime, because it can be changed into another prime (18844851632071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422425816040 + 9422425816041.

It is an arithmetic number, because the mean of its divisors is an integer number (9422425816041).

Almost surely, 2^{18844851632081} is an apocalyptic number.

It is an amenable number.

18844851632081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844851632081 is an equidigital number, since it uses as much as digits as its factorization.

18844851632081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11796480, while the sum is 59.

The spelling of 18844851632081 in words is "eighteen trillion, eight hundred forty-four billion, eight hundred fifty-one million, six hundred thirty-two thousand, eighty-one".