581012875561 has 2 divisors, whose sum is σ = 581012875562. Its totient is φ = 581012875560.

The previous prime is 581012875559. The next prime is 581012875571. The reversal of 581012875561 is 165578210185.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 554876010000 + 26136865561 = 744900^2 + 161669^2 .

It is a cyclic number.

It is not a de Polignac number, because 581012875561 - 2¹ = 581012875559 is a prime.

Together with 581012875559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (581012875571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290506437780 + 290506437781.

It is an arithmetic number, because the mean of its divisors is an integer number (290506437781).

Almost surely, 2^581012875561 is an apocalyptic number.

It is an amenable number.

581012875561 is a deficient number, since it is larger than the sum of its proper divisors (1).

581012875561 is an equidigital number, since it uses as much as digits as its factorization.

581012875561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672000, while the sum is 49.

The spelling of 581012875561 in words is "five hundred eighty-one billion, twelve million, eight hundred seventy-five thousand, five hundred sixty-one".