660945 has 16 divisors (see below), whose sum is σ = 1068480. Its totient is φ = 348864.

The previous prime is 660941. The next prime is 660949. The reversal of 660945 is 549066.

It is an interprime number because it is at equal distance from previous prime (660941) and next prime (660949).

It is not a de Polignac number, because 660945 - 2² = 660941 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660945.

It is not an unprimeable number, because it can be changed into a prime (660941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1927 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (66780).

2⁶⁶⁰⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

660945 is a deficient number, since it is larger than the sum of its proper divisors (407535).

660945 is a wasteful number, since it uses less digits than its factorization.

660945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 660945 is about 812.9852397184. The cubic root of 660945 is about 87.1074112634.

The spelling of 660945 in words is "six hundred sixty thousand, nine hundred forty-five".