605555561 has 6 divisors (see below), whose sum is σ = 655720110. Its totient is φ = 558974208.

The previous prime is 605555557. The next prime is 605555597. The reversal of 605555561 is 165555506.

It can be written as a sum of positive squares in 3 ways, for example, as 87310336 + 518245225 = 9344^2 + 22765^2 .

It is not a de Polignac number, because 605555561 - 2² = 605555557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (605555501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1791416 + ... + 1791753.

It is an arithmetic number, because the mean of its divisors is an integer number (109286685).

Almost surely, 2^605555561 is an apocalyptic number.

It is an amenable number.

605555561 is a deficient number, since it is larger than the sum of its proper divisors (50164549).

605555561 is a wasteful number, since it uses less digits than its factorization.

605555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583195 (or 3583182 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 605555561 is about 24608.0385443456. The cubic root of 605555561 is about 846.0278616238.

It can be divided in two parts, 6055 and 55561, that added together give a palindrome (61616).

The spelling of 605555561 in words is "six hundred five million, five hundred fifty-five thousand, five hundred sixty-one".