65660606505556 has 12 divisors (see below), whose sum is σ = 115069978738260. Its totient is φ = 32783469723200.

The previous prime is 65660606505553. The next prime is 65660606505563. The reversal of 65660606505556 is 65550560606656.

65660606505556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 35858659004100 + 29801947501456 = 5988210^2 + 5459116^2 .

It is a super-3 number, since 3×65660606505556³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 65660606505494 and 65660606505503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65660606505553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11708379241 + ... + 11708384848.

It is an arithmetic number, because the mean of its divisors is an integer number (9589164894855).

Almost surely, 2^{65660606505556} is an apocalyptic number.

It is an amenable number.

65660606505556 is a deficient number, since it is larger than the sum of its proper divisors (49409372232704).

65660606505556 is a wasteful number, since it uses less digits than its factorization.

65660606505556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23416764794 (or 23416764792 counting only the distinct ones).

The product of its (nonzero) digits is 145800000, while the sum is 61.

The spelling of 65660606505556 in words is "sixty-five trillion, six hundred sixty billion, six hundred six million, five hundred five thousand, five hundred fifty-six".