1808647536481 has 2 divisors, whose sum is σ = 1808647536482. Its totient is φ = 1808647536480.

The previous prime is 1808647536467. The next prime is 1808647536491. The reversal of 1808647536481 is 1846357468081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1076698844881 + 731948691600 = 1037641^2 + 855540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808647536481 - 2³⁹ = 1258891722593 is a prime.

It is a super-2 number, since 2×1808647536481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1808647536491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904323768240 + 904323768241.

It is an arithmetic number, because the mean of its divisors is an integer number (904323768241).

Almost surely, 2^{1808647536481} is an apocalyptic number.

It is an amenable number.

1808647536481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808647536481 is an equidigital number, since it uses as much as digits as its factorization.

1808647536481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 1808647536481 in words is "one trillion, eight hundred eight billion, six hundred forty-seven million, five hundred thirty-six thousand, four hundred eighty-one".