56601565561 has 8 divisors (see below), whose sum is σ = 56853260424. Its totient is φ = 56350419840.

The previous prime is 56601565547. The next prime is 56601565577. The reversal of 56601565561 is 16556510665.

It can be written as a sum of positive squares in 4 ways, for example, as 19219663225 + 37381902336 = 138635^2 + 193344^2 .

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 56601565561 - 2⁵ = 56601565529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56601565541) 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, 70011 + ... + 343663.

It is an arithmetic number, because the mean of its divisors is an integer number (7106657553).

Almost surely, 2^56601565561 is an apocalyptic number.

It is an amenable number.

56601565561 is a deficient number, since it is larger than the sum of its proper divisors (251694863).

56601565561 is a wasteful number, since it uses less digits than its factorization.

56601565561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274571.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 56601565561 in words is "fifty-six billion, six hundred one million, five hundred sixty-five thousand, five hundred sixty-one".