56566011505 has 4 divisors (see below), whose sum is σ = 67879213812. Its totient is φ = 45252809200.

The previous prime is 56566011503. The next prime is 56566011517. The reversal of 56566011505 is 50511066565.

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 22343971441 + 34222040064 = 149479^2 + 184992^2 .

It is not a de Polignac number, because 56566011505 - 2¹ = 56566011503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56566011503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5656601146 + ... + 5656601155.

It is an arithmetic number, because the mean of its divisors is an integer number (16969803453).

Almost surely, 2^56566011505 is an apocalyptic number.

It is an amenable number.

56566011505 is a deficient number, since it is larger than the sum of its proper divisors (11313202307).

56566011505 is a wasteful number, since it uses less digits than its factorization.

56566011505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11313202306.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 56566011505 in words is "fifty-six billion, five hundred sixty-six million, eleven thousand, five hundred five".