660135 has 16 divisors (see below), whose sum is σ = 1207296. Its totient is φ = 301728.

The previous prime is 660131. The next prime is 660137. The reversal of 660135 is 531066.

It is not a de Polignac number, because 660135 - 2² = 660131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

660135 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660131) 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, 3039 + ... + 3248.

It is an arithmetic number, because the mean of its divisors is an integer number (75456).

2⁶⁶⁰¹³⁵ is an apocalyptic number.

660135 is a deficient number, since it is larger than the sum of its proper divisors (547161).

660135 is a wasteful number, since it uses less digits than its factorization.

660135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 660135 is about 812.4869229717. The cubic root of 660135 is about 87.0718128168.

Adding to 660135 its product of nonzero digits (540), we get a triangular number (660675 = T₁₁₄₉).

The spelling of 660135 in words is "six hundred sixty thousand, one hundred thirty-five".