6560116521681 has 4 divisors (see below), whose sum is σ = 8746822028912. Its totient is φ = 4373411014452.

The previous prime is 6560116521671. The next prime is 6560116521769. The reversal of 6560116521681 is 1861256110656.

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.

It is not a de Polignac number, because 6560116521681 - 2¹⁴ = 6560116505297 is a prime.

It is a super-2 number, since 2×6560116521681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6560116521681.

It is not an unprimeable number, because it can be changed into a prime (6560116521661) 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, 1093352753611 + ... + 1093352753616.

It is an arithmetic number, because the mean of its divisors is an integer number (2186705507228).

Almost surely, 2^{6560116521681} is an apocalyptic number.

It is an amenable number.

6560116521681 is a deficient number, since it is larger than the sum of its proper divisors (2186705507231).

6560116521681 is a wasteful number, since it uses less digits than its factorization.

6560116521681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186705507230.

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 6560116521681 in words is "six trillion, five hundred sixty billion, one hundred sixteen million, five hundred twenty-one thousand, six hundred eighty-one".