56571064581 has 16 divisors (see below), whose sum is σ = 79330337280. Its totient is φ = 35808826560.

The previous prime is 56571064541. The next prime is 56571064601. The reversal of 56571064581 is 18546017565.

It is not a de Polignac number, because 56571064581 - 2⁷ = 56571064453 is a prime.

It is a super-2 number, since 2×56571064581² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56571064581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56571064541) 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 15 ways as a sum of consecutive naturals, for example, 5733666 + ... + 5743523.

It is an arithmetic number, because the mean of its divisors is an integer number (4958146080).

Almost surely, 2^56571064581 is an apocalyptic number.

It is an amenable number.

56571064581 is a deficient number, since it is larger than the sum of its proper divisors (22759272699).

56571064581 is a wasteful number, since it uses less digits than its factorization.

56571064581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11477276.

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 56571064581 in words is "fifty-six billion, five hundred seventy-one million, sixty-four thousand, five hundred eighty-one".