660145 has 8 divisors (see below), whose sum is σ = 817920. Its totient is φ = 510960.

The previous prime is 660137. The next prime is 660157. The reversal of 660145 is 541066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660145 - 2³ = 660137 is a prime.

660145 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1975 + ... + 2284.

It is an arithmetic number, because the mean of its divisors is an integer number (102240).

2⁶⁶⁰¹⁴⁵ is an apocalyptic number.

It is an amenable number.

660145 is a deficient number, since it is larger than the sum of its proper divisors (157775).

660145 is a wasteful number, since it uses less digits than its factorization.

660145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 660145 is about 812.4930768936. The cubic root of 660145 is about 87.0722524813.

The spelling of 660145 in words is "six hundred sixty thousand, one hundred forty-five".