660955 has 8 divisors (see below), whose sum is σ = 805392. Its totient is φ = 520608.

The previous prime is 660949. The next prime is 660973. The reversal of 660955 is 559066.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 660955 - 2⁵ = 660923 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (100674).

2⁶⁶⁰⁹⁵⁵ is an apocalyptic number.

660955 is a deficient number, since it is larger than the sum of its proper divisors (144437).

660955 is a wasteful number, since it uses less digits than its factorization.

660955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 660955 is about 812.9913898683. The cubic root of 660955 is about 87.1078505685.

The spelling of 660955 in words is "six hundred sixty thousand, nine hundred fifty-five".