660916605 has 16 divisors (see below), whose sum is σ = 1060470720. Its totient is φ = 351487488.

The previous prime is 660916603. The next prime is 660916651. The reversal of 660916605 is 506619066.

It is not a de Polignac number, because 660916605 - 2¹ = 660916603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660916601) 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 15 ways as a sum of consecutive naturals, for example, 57115 + ... + 67704.

It is an arithmetic number, because the mean of its divisors is an integer number (66279420).

Almost surely, 2^660916605 is an apocalyptic number.

It is an amenable number.

660916605 is a deficient number, since it is larger than the sum of its proper divisors (399554115).

660916605 is a wasteful number, since it uses less digits than its factorization.

660916605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125180.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 660916605 is about 25708.2983684257. The cubic root of 660916605 is about 871.0616383209.

The spelling of 660916605 in words is "six hundred sixty million, nine hundred sixteen thousand, six hundred five".