56505016561 has 8 divisors (see below), whose sum is σ = 64597051584. Its totient is φ = 48417954000.

The previous prime is 56505016507. The next prime is 56505016571. The reversal of 56505016561 is 16561050565.

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 56505016561 - 2¹³ = 56505008369 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56505016571) 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 7 ways as a sum of consecutive naturals, for example, 1218730 + ... + 1264243.

It is an arithmetic number, because the mean of its divisors is an integer number (8074631448).

Almost surely, 2^56505016561 is an apocalyptic number.

It is an amenable number.

56505016561 is a deficient number, since it is larger than the sum of its proper divisors (8092035023).

56505016561 is a wasteful number, since it uses less digits than its factorization.

56505016561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486231.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 56505016561 in words is "fifty-six billion, five hundred five million, sixteen thousand, five hundred sixty-one".