660866521117 has 16 divisors (see below), whose sum is σ = 754242741504. Its totient is φ = 573663424000.

The previous prime is 660866521061. The next prime is 660866521129. The reversal of 660866521117 is 711125668066.

It is a cyclic number.

It is not a de Polignac number, because 660866521117 - 2¹¹ = 660866519069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660866221117) 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 15 ways as a sum of consecutive naturals, for example, 15567484 + ... + 15609877.

It is an arithmetic number, because the mean of its divisors is an integer number (47140171344).

Almost surely, 2^660866521117 is an apocalyptic number.

It is an amenable number.

660866521117 is a deficient number, since it is larger than the sum of its proper divisors (93376220387).

660866521117 is a wasteful number, since it uses less digits than its factorization.

660866521117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31177460.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 660866521117 in words is "six hundred sixty billion, eight hundred sixty-six million, five hundred twenty-one thousand, one hundred seventeen".