56506506561565 has 16 divisors (see below), whose sum is σ = 71448664849920. Its totient is φ = 42782768930880.

The previous prime is 56506506561559. The next prime is 56506506561581. The reversal of 56506506561565 is 56516560560565.

It is a happy number.

It is not a de Polignac number, because 56506506561565 - 2³³ = 56497916626973 is a prime.

It is a super-3 number, since 3×56506506561565³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300009454 + ... + 300197743.

It is an arithmetic number, because the mean of its divisors is an integer number (4465541553120).

Almost surely, 2^{56506506561565} is an apocalyptic number.

It is an amenable number.

56506506561565 is a deficient number, since it is larger than the sum of its proper divisors (14942158288355).

56506506561565 is a wasteful number, since it uses less digits than its factorization.

56506506561565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600208212.

The product of its (nonzero) digits is 121500000, while the sum is 61.

The spelling of 56506506561565 in words is "fifty-six trillion, five hundred six billion, five hundred six million, five hundred sixty-one thousand, five hundred sixty-five".