610565501561 has 2 divisors, whose sum is σ = 610565501562. Its totient is φ = 610565501560.

The previous prime is 610565501527. The next prime is 610565501621. The reversal of 610565501561 is 165105565016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441434004025 + 169131497536 = 664405^2 + 411256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-610565501561 is a prime.

It is not a weakly prime, because it can be changed into another prime (610565801561) 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, 305282750780 + 305282750781.

It is an arithmetic number, because the mean of its divisors is an integer number (305282750781).

Almost surely, 2^610565501561 is an apocalyptic number.

It is an amenable number.

610565501561 is a deficient number, since it is larger than the sum of its proper divisors (1).

610565501561 is an equidigital number, since it uses as much as digits as its factorization.

610565501561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 610565501561 in words is "six hundred ten billion, five hundred sixty-five million, five hundred one thousand, five hundred sixty-one".