65508606081 has 6 divisors (see below), whose sum is σ = 94623542130. Its totient is φ = 43672404048.

The previous prime is 65508606077. The next prime is 65508606113. The reversal of 65508606081 is 18060680556.

65508606081 is a `hidden beast` number, since 6 + 5 + 508 + 6 + 0 + 60 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64609505856 + 899100225 = 254184^2 + 29985^2 .

It is not a de Polignac number, because 65508606081 - 2² = 65508606077 is a prime.

It is a super-2 number, since 2×65508606081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65508606281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3639366996 + ... + 3639367013.

It is an arithmetic number, because the mean of its divisors is an integer number (15770590355).

Almost surely, 2^65508606081 is an apocalyptic number.

It is an amenable number.

65508606081 is a deficient number, since it is larger than the sum of its proper divisors (29114936049).

65508606081 is a wasteful number, since it uses less digits than its factorization.

65508606081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278734015 (or 7278734012 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 65508606081 in words is "sixty-five billion, five hundred eight million, six hundred six thousand, eighty-one".