660680305 has 8 divisors (see below), whose sum is σ = 795319272. Its totient is φ = 526875648.

The previous prime is 660680287. The next prime is 660680309. The reversal of 660680305 is 503086066.

660680305 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 4 ways, for example, as 29062881 + 631617424 = 5391^2 + 25132^2 .

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 660680305 - 2⁹ = 660679793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660680309) 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, 206832 + ... + 210001.

It is an arithmetic number, because the mean of its divisors is an integer number (99414909).

Almost surely, 2^660680305 is an apocalyptic number.

It is an amenable number.

660680305 is a deficient number, since it is larger than the sum of its proper divisors (134638967).

660680305 is a wasteful number, since it uses less digits than its factorization.

660680305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417155.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 660680305 is about 25703.7021652524. The cubic root of 660680305 is about 870.9578146317.

The spelling of 660680305 in words is "six hundred sixty million, six hundred eighty thousand, three hundred five".