660099 has 16 divisors (see below), whose sum is σ = 975744. Its totient is φ = 393600.

The previous prime is 660097. The next prime is 660103. The reversal of 660099 is 990066.

It is not a de Polignac number, because 660099 - 2¹ = 660097 is a prime.

660099 is a strobogrammatic number because it is the same when read upside-down.

660099 is a modest number, since divided by 99 gives 66 as remainder.

660099 is a lucky number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (660097) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2619 + ... + 2859.

It is an arithmetic number, because the mean of its divisors is an integer number (60984).

2⁶⁶⁰⁰⁹⁹ is an apocalyptic number.

660099 is a deficient number, since it is larger than the sum of its proper divisors (315645).

660099 is a wasteful number, since it uses less digits than its factorization.

660099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 660099 is about 812.4647684669. The cubic root of 660099 is about 87.0702299879.

The spelling of 660099 in words is "six hundred sixty thousand, ninety-nine".