660655366506511 has 8 divisors (see below), whose sum is σ = 679636767787200. Its totient is φ = 641879169564288.

The previous prime is 660655366506497. The next prime is 660655366506517. The reversal of 660655366506511 is 115605663556066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660655366506511 - 2⁵ = 660655366506479 is a prime.

It is a super-4 number, since 4×660655366506511⁴ (a number of 60 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660655366506511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660655366506517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51301078086 + ... + 51301090963.

It is an arithmetic number, because the mean of its divisors is an integer number (84954595973400).

Almost surely, 2^{660655366506511} is an apocalyptic number.

660655366506511 is a deficient number, since it is larger than the sum of its proper divisors (18981401280689).

660655366506511 is a wasteful number, since it uses less digits than its factorization.

660655366506511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102602169233.

The product of its (nonzero) digits is 87480000, while the sum is 61.

The spelling of 660655366506511 in words is "six hundred sixty trillion, six hundred fifty-five billion, three hundred sixty-six million, five hundred six thousand, five hundred eleven".