660995 has 4 divisors (see below), whose sum is σ = 793200. Its totient is φ = 528792.

The previous prime is 660983. The next prime is 661009. The reversal of 660995 is 599066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660995 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66095 + ... + 66104.

It is an arithmetic number, because the mean of its divisors is an integer number (198300).

2⁶⁶⁰⁹⁹⁵ is an apocalyptic number.

660995 is a deficient number, since it is larger than the sum of its proper divisors (132205).

660995 is a wasteful number, since it uses less digits than its factorization.

660995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132204.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 660995 is about 813.0159900027. The cubic root of 660995 is about 87.1096077450.

The spelling of 660995 in words is "six hundred sixty thousand, nine hundred ninety-five".