660245 has 4 divisors (see below), whose sum is σ = 792300. Its totient is φ = 528192.

The previous prime is 660241. The next prime is 660251. The reversal of 660245 is 542066.

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 320356 + 339889 = 566^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 660245 - 2² = 660241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660241) 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, 66020 + ... + 66029.

It is an arithmetic number, because the mean of its divisors is an integer number (198075).

2⁶⁶⁰²⁴⁵ is an apocalyptic number.

It is an amenable number.

660245 is a deficient number, since it is larger than the sum of its proper divisors (132055).

660245 is a wasteful number, since it uses less digits than its factorization.

660245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132054.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 660245 is about 812.5546135491. The cubic root of 660245 is about 87.0766488819.

The spelling of 660245 in words is "six hundred sixty thousand, two hundred forty-five".