660655 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 520800.

The previous prime is 660643. The next prime is 660659. The reversal of 660655 is 556066.

660655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 660655 - 2¹¹ = 658607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576 + ... + 1285.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁶⁶⁰⁶⁵⁵ is an apocalyptic number.

660655 is a deficient number, since it is larger than the sum of its proper divisors (143729).

660655 is a wasteful number, since it uses less digits than its factorization.

660655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 660655 is about 812.8068651285. The cubic root of 660655 is about 87.0946694847.

The spelling of 660655 in words is "six hundred sixty thousand, six hundred fifty-five".