566566655509 has 4 divisors (see below), whose sum is σ = 566577146304. Its totient is φ = 566556164716.

The previous prime is 566566655449. The next prime is 566566655531. The reversal of 566566655509 is 905556665665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 566566655509 - 2¹⁷ = 566566524437 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 (566566655539) 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, 5163967 + ... + 5272540.

It is an arithmetic number, because the mean of its divisors is an integer number (141644286576).

Almost surely, 2^566566655509 is an apocalyptic number.

It is an amenable number.

566566655509 is a deficient number, since it is larger than the sum of its proper divisors (10490795).

566566655509 is a wasteful number, since it uses less digits than its factorization.

566566655509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10490794.

The product of its (nonzero) digits is 218700000, while the sum is 64.

The spelling of 566566655509 in words is "five hundred sixty-six billion, five hundred sixty-six million, six hundred fifty-five thousand, five hundred nine".