666903 has 16 divisors (see below), whose sum is σ = 940032. Its totient is φ = 420000.

The previous prime is 666901. The next prime is 666929. The reversal of 666903 is 309666.

666903 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666903 - 2¹ = 666901 is a prime.

It is a super-4 number, since 4×666903⁴ (a number of 24 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666901) 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, 6553 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (58752).

2⁶⁶⁶⁹⁰³ is an apocalyptic number.

666903 is a deficient number, since it is larger than the sum of its proper divisors (273129).

666903 is a wasteful number, since it uses less digits than its factorization.

666903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 666903 is about 816.6412921228. The cubic root of 666903 is about 87.3683680632.

The spelling of 666903 in words is "six hundred sixty-six thousand, nine hundred three".