666303 has 16 divisors (see below), whose sum is σ = 988032. Its totient is φ = 396000.

The previous prime is 666301. The next prime is 666329. The reversal of 666303 is 303666.

It is not a de Polignac number, because 666303 - 2¹ = 666301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1848 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (61752).

2⁶⁶⁶³⁰³ is an apocalyptic number.

666303 is a deficient number, since it is larger than the sum of its proper divisors (321729).

666303 is a wasteful number, since it uses less digits than its factorization.

666303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 666303 is about 816.2738511064. The cubic root of 666303 is about 87.3421589796.

Adding to 666303 its reverse (303666), we get a palindrome (969969).

It can be divided in two parts, 666 and 303, that added together give a palindrome (969).

The spelling of 666303 in words is "six hundred sixty-six thousand, three hundred three".