660538617 has 4 divisors (see below), whose sum is σ = 880718160. Its totient is φ = 440359076.

The previous prime is 660538603. The next prime is 660538649. The reversal of 660538617 is 716835066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660538617 - 2¹⁵ = 660505849 is a prime.

It is a super-3 number, since 3×660538617³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (660538117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110089767 + ... + 110089772.

It is an arithmetic number, because the mean of its divisors is an integer number (220179540).

Almost surely, 2^660538617 is an apocalyptic number.

It is an amenable number.

660538617 is a deficient number, since it is larger than the sum of its proper divisors (220179543).

660538617 is a wasteful number, since it uses less digits than its factorization.

660538617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220179542.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 660538617 is about 25700.9458386263. The cubic root of 660538617 is about 870.8955489677.

The spelling of 660538617 in words is "six hundred sixty million, five hundred thirty-eight thousand, six hundred seventeen".