565605616661 has 16 divisors (see below), whose sum is σ = 577544048640. Its totient is φ = 553790106240.

The previous prime is 565605616657. The next prime is 565605616669. The reversal of 565605616661 is 166616506565.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 565605616661 - 2² = 565605616657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565605616669) 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 in 15 ways as a sum of consecutive naturals, for example, 6291335 + ... + 6380603.

It is an arithmetic number, because the mean of its divisors is an integer number (36096503040).

Almost surely, 2^565605616661 is an apocalyptic number.

It is an amenable number.

565605616661 is a deficient number, since it is larger than the sum of its proper divisors (11938431979).

565605616661 is a wasteful number, since it uses less digits than its factorization.

565605616661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89956.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 565605616661 in words is "five hundred sixty-five billion, six hundred five million, six hundred sixteen thousand, six hundred sixty-one".