56560645261 has 4 divisors (see below), whose sum is σ = 56601076000. Its totient is φ = 56520214524.

The previous prime is 56560645237. The next prime is 56560645279. The reversal of 56560645261 is 16254606565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16254606565 = 5 ⋅3250921313.

It is a cyclic number.

It is not a de Polignac number, because 56560645261 - 2⁷ = 56560645133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56560645861) 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 3 ways as a sum of consecutive naturals, for example, 20213271 + ... + 20216068.

It is an arithmetic number, because the mean of its divisors is an integer number (14150269000).

Almost surely, 2^56560645261 is an apocalyptic number.

It is an amenable number.

56560645261 is a deficient number, since it is larger than the sum of its proper divisors (40430739).

56560645261 is a wasteful number, since it uses less digits than its factorization.

56560645261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40430738.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 56560645261 in words is "fifty-six billion, five hundred sixty million, six hundred forty-five thousand, two hundred sixty-one".