56643440517 has 6 divisors (see below), whose sum is σ = 81818302982. Its totient is φ = 37762293672.

The previous prime is 56643440507. The next prime is 56643440519. The reversal of 56643440517 is 71504434665.

56643440517 is a `hidden beast` number, since 5 + 6 + 64 + 34 + 40 + 517 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50189888961 + 6453551556 = 224031^2 + 80334^2 .

It is not a de Polignac number, because 56643440517 - 2⁴ = 56643440501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56643440519) 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 5 ways as a sum of consecutive naturals, for example, 3146857798 + ... + 3146857815.

Almost surely, 2^56643440517 is an apocalyptic number.

It is an amenable number.

56643440517 is a deficient number, since it is larger than the sum of its proper divisors (25174862465).

56643440517 is a wasteful number, since it uses less digits than its factorization.

56643440517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293715619 (or 6293715616 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 56643440517 in words is "fifty-six billion, six hundred forty-three million, four hundred forty thousand, five hundred seventeen".