65560481681 has 4 divisors (see below), whose sum is σ = 66161954100. Its totient is φ = 64959009264.

The previous prime is 65560481671. The next prime is 65560481683. The reversal of 65560481681 is 18618406556.

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 51173678656 + 14386803025 = 226216^2 + 119945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65560481681 is a prime.

It is a super-2 number, since 2×65560481681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65560481683) 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, 300736046 + ... + 300736263.

It is an arithmetic number, because the mean of its divisors is an integer number (16540488525).

Almost surely, 2^65560481681 is an apocalyptic number.

It is an amenable number.

65560481681 is a deficient number, since it is larger than the sum of its proper divisors (601472419).

65560481681 is a wasteful number, since it uses less digits than its factorization.

65560481681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601472418.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 65560481681 in words is "sixty-five billion, five hundred sixty million, four hundred eighty-one thousand, six hundred eighty-one".