56565511556505 has 128 divisors (see below), whose sum is σ = 106097138454528. Its totient is φ = 25201605952512.

The previous prime is 56565511556459. The next prime is 56565511556507. The reversal of 56565511556505 is 50565511556565.

It is a happy number.

It is not a de Polignac number, because 56565511556505 - 2¹⁵ = 56565511523737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56565511556507) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 581823279 + ... + 581920491.

It is an arithmetic number, because the mean of its divisors is an integer number (828883894176).

Almost surely, 2^{56565511556505} is an apocalyptic number.

It is an amenable number.

56565511556505 is a deficient number, since it is larger than the sum of its proper divisors (49531626898023).

56565511556505 is a wasteful number, since it uses less digits than its factorization.

56565511556505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98175.

The product of its (nonzero) digits is 84375000, while the sum is 60.

Adding to 56565511556505 its sum of digits (60), we get a palindrome (56565511556565).

It can be divided in two parts, 56565511 and 556505, that added together give a triangular number (57122016 = T₁₀₆₈₈).

The spelling of 56565511556505 in words is "fifty-six trillion, five hundred sixty-five billion, five hundred eleven million, five hundred fifty-six thousand, five hundred five".