568661801852561 has 8 divisors (see below), whose sum is σ = 568947072926280. Its totient is φ = 568376534089728.

The previous prime is 568661801852531. The next prime is 568661801852587. The reversal of 568661801852561 is 165258108166865.

It can be written as a sum of positive squares in 4 ways, for example, as 22473819310336 + 546187982542225 = 4740656^2 + 23370665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-568661801852561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 568661801852491 and 568661801852500.

It is not an unprimeable number, because it can be changed into a prime (568661801852531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388665785 + ... + 390126153.

It is an arithmetic number, because the mean of its divisors is an integer number (71118384115785).

Almost surely, 2^{568661801852561} is an apocalyptic number.

It is an amenable number.

568661801852561 is a deficient number, since it is larger than the sum of its proper divisors (285271073719).

568661801852561 is a wasteful number, since it uses less digits than its factorization.

568661801852561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655443.

The product of its (nonzero) digits is 165888000, while the sum is 68.

The spelling of 568661801852561 in words is "five hundred sixty-eight trillion, six hundred sixty-one billion, eight hundred one million, eight hundred fifty-two thousand, five hundred sixty-one".