5606666666561 has 4 divisors (see below), whose sum is σ = 5606692205652. Its totient is φ = 5606641127472.

The previous prime is 5606666666539. The next prime is 5606666666593. The reversal of 5606666666561 is 1656666666065.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4642813968961 + 963852697600 = 2154719^2 + 981760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5606666666561 is a prime.

It is a super-2 number, since 2×5606666666561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5606666662561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12437366 + ... + 12880271.

It is an arithmetic number, because the mean of its divisors is an integer number (1401673051413).

Almost surely, 2^{5606666666561} is an apocalyptic number.

It is an amenable number.

5606666666561 is a deficient number, since it is larger than the sum of its proper divisors (25539091).

5606666666561 is a wasteful number, since it uses less digits than its factorization.

5606666666561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25539090.

The product of its (nonzero) digits is 251942400, while the sum is 65.

It can be divided in two parts, 560666 and 6666561, that added together give a palindrome (7227227).

The spelling of 5606666666561 in words is "five trillion, six hundred six billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred sixty-one".