605585320721 has 2 divisors, whose sum is σ = 605585320722. Its totient is φ = 605585320720.

The previous prime is 605585320687. The next prime is 605585320741. The reversal of 605585320721 is 127023585506.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604916839696 + 668481025 = 777764^2 + 25855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-605585320721 is a prime.

It is not a weakly prime, because it can be changed into another prime (605585320741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302792660360 + 302792660361.

It is an arithmetic number, because the mean of its divisors is an integer number (302792660361).

Almost surely, 2^605585320721 is an apocalyptic number.

It is an amenable number.

605585320721 is a deficient number, since it is larger than the sum of its proper divisors (1).

605585320721 is an equidigital number, since it uses as much as digits as its factorization.

605585320721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 605585320721 in words is "six hundred five billion, five hundred eighty-five million, three hundred twenty thousand, seven hundred twenty-one".