56505065561 has 8 divisors (see below), whose sum is σ = 67976018880. Its totient is φ = 45883812528.

The previous prime is 56505065549. The next prime is 56505065587. The reversal of 56505065561 is 16556050565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56505065561 - 2³⁰ = 55431323737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56505065531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212424926 + ... + 212425191.

It is an arithmetic number, because the mean of its divisors is an integer number (8497002360).

Almost surely, 2^56505065561 is an apocalyptic number.

It is an amenable number.

56505065561 is a deficient number, since it is larger than the sum of its proper divisors (11470953319).

56505065561 is a wasteful number, since it uses less digits than its factorization.

56505065561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424850143.

The product of its (nonzero) digits is 675000, while the sum is 44.

The spelling of 56505065561 in words is "fifty-six billion, five hundred five million, sixty-five thousand, five hundred sixty-one".