606655561 has 2 divisors, whose sum is σ = 606655562. Its totient is φ = 606655560.

The previous prime is 606655559. The next prime is 606655573. The reversal of 606655561 is 165556606.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521665600 + 84989961 = 22840^2 + 9219^2 .

It is a cyclic number.

It is not a de Polignac number, because 606655561 - 2¹ = 606655559 is a prime.

Together with 606655559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (606055561) 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 as a sum of consecutive naturals, namely, 303327780 + 303327781.

It is an arithmetic number, because the mean of its divisors is an integer number (303327781).

Almost surely, 2^606655561 is an apocalyptic number.

It is an amenable number.

606655561 is a deficient number, since it is larger than the sum of its proper divisors (1).

606655561 is an equidigital number, since it uses as much as digits as its factorization.

606655561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 606655561 is about 24630.3788237209. The cubic root of 606655561 is about 846.5398254988.

The spelling of 606655561 in words is "six hundred six million, six hundred fifty-five thousand, five hundred sixty-one".