660560017 has 4 divisors (see below), whose sum is σ = 711372340. Its totient is φ = 609747696.

The previous prime is 660559981. The next prime is 660560029. The reversal of 660560017 is 710065066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 328008321 + 332551696 = 18111^2 + 18236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660560017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660560077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25406142 + ... + 25406167.

It is an arithmetic number, because the mean of its divisors is an integer number (177843085).

Almost surely, 2^660560017 is an apocalyptic number.

It is an amenable number.

660560017 is a deficient number, since it is larger than the sum of its proper divisors (50812323).

660560017 is a wasteful number, since it uses less digits than its factorization.

660560017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50812322.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 660560017 is about 25701.3621623446. The cubic root of 660560017 is about 870.9049539003.

The spelling of 660560017 in words is "six hundred sixty million, five hundred sixty thousand, seventeen".