56005510591 has 4 divisors (see below), whose sum is σ = 57062218392. Its totient is φ = 54948802792.

The previous prime is 56005510579. The next prime is 56005510619. The reversal of 56005510591 is 19501550065.

It is a happy number.

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

It is not a de Polignac number, because 56005510591 - 2¹⁵ = 56005477823 is a prime.

It is a super-2 number, since 2×56005510591² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56005510591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56005510541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528353821 + ... + 528353926.

It is an arithmetic number, because the mean of its divisors is an integer number (14265554598).

Almost surely, 2^56005510591 is an apocalyptic number.

56005510591 is a deficient number, since it is larger than the sum of its proper divisors (1056707801).

56005510591 is a wasteful number, since it uses less digits than its factorization.

56005510591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056707800.

The product of its (nonzero) digits is 33750, while the sum is 37.

The spelling of 56005510591 in words is "fifty-six billion, five million, five hundred ten thousand, five hundred ninety-one".