666075 has 24 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 347680.

The previous prime is 666073. The next prime is 666079. The reversal of 666075 is 570666.

It is not a de Polignac number, because 666075 - 2¹ = 666073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666073) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6172 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (46872).

2⁶⁶⁶⁰⁷⁵ is an apocalyptic number.

666075 is a deficient number, since it is larger than the sum of its proper divisors (458853).

666075 is a wasteful number, since it uses less digits than its factorization.

666075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 666075 is about 816.1341801444. The cubic root of 666075 is about 87.3321954024.

It can be divided in two parts, 6660 and 75, that multiplied together give a triangular number (499500 = T₉₉₉).

The spelling of 666075 in words is "six hundred sixty-six thousand, seventy-five".