56005210120561 has 4 divisors (see below), whose sum is σ = 60313303206772. Its totient is φ = 51697117034352.

The previous prime is 56005210120493. The next prime is 56005210120583. The reversal of 56005210120561 is 16502101250065.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2483914689936 + 53521295430625 = 1576044^2 + 7315825^2 .

It is a cyclic number.

It is not a de Polignac number, because 56005210120561 - 2¹¹ = 56005210118513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56005210127561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2154046543086 + ... + 2154046543111.

It is an arithmetic number, because the mean of its divisors is an integer number (15078325801693).

Almost surely, 2^{56005210120561} is an apocalyptic number.

It is an amenable number.

56005210120561 is a deficient number, since it is larger than the sum of its proper divisors (4308093086211).

56005210120561 is a wasteful number, since it uses less digits than its factorization.

56005210120561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308093086210.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 56005210120561 in words is "fifty-six trillion, five billion, two hundred ten million, one hundred twenty thousand, five hundred sixty-one".