660755 has 4 divisors (see below), whose sum is σ = 792912. Its totient is φ = 528600.

The previous prime is 660733. The next prime is 660757. The reversal of 660755 is 557066.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 660755 - 2¹⁸ = 398611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660757) 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, 66071 + ... + 66080.

It is an arithmetic number, because the mean of its divisors is an integer number (198228).

2⁶⁶⁰⁷⁵⁵ is an apocalyptic number.

660755 is a deficient number, since it is larger than the sum of its proper divisors (132157).

660755 is a wasteful number, since it uses less digits than its factorization.

660755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132156.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 660755 is about 812.8683780293. The cubic root of 660755 is about 87.0990636226.

The spelling of 660755 in words is "six hundred sixty thousand, seven hundred fifty-five".