56321550565 has 32 divisors (see below), whose sum is σ = 81365760000. Its totient is φ = 36561077568.

The previous prime is 56321550559. The next prime is 56321550577. The reversal of 56321550565 is 56505512365.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56321550565 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 900066 + ... + 960604.

It is an arithmetic number, because the mean of its divisors is an integer number (2542680000).

Almost surely, 2^56321550565 is an apocalyptic number.

It is an amenable number.

56321550565 is a deficient number, since it is larger than the sum of its proper divisors (25044209435).

56321550565 is a wasteful number, since it uses less digits than its factorization.

56321550565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61969.

The product of its (nonzero) digits is 675000, while the sum is 43.

The spelling of 56321550565 in words is "fifty-six billion, three hundred twenty-one million, five hundred fifty thousand, five hundred sixty-five".