56565656566 has 4 divisors (see below), whose sum is σ = 84848484852. Its totient is φ = 28282828282.

The previous prime is 56565656531. The next prime is 56565656591. The reversal of 56565656566 is 66565656565.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14141414140 + ... + 14141414143.

It is an arithmetic number, because the mean of its divisors is an integer number (21212121213).

Almost surely, 2^56565656566 is an apocalyptic number.

56565656566 is a deficient number, since it is larger than the sum of its proper divisors (28282828286).

56565656566 is a wasteful number, since it uses less digits than its factorization.

56565656566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28282828285.

The product of its digits is 145800000, while the sum is 61.

Subtracting 56565656566 from its reverse (66565656565), we obtain a palindrome (9999999999).

The spelling of 56565656566 in words is "fifty-six billion, five hundred sixty-five million, six hundred fifty-six thousand, five hundred sixty-six".