6666003 has 8 divisors (see below), whose sum is σ = 9875600. Its totient is φ = 4443984.

The previous prime is 6666001. The next prime is 6666029. The reversal of 6666003 is 3006666.

It is not a de Polignac number, because 6666003 - 2¹ = 6666001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 246889 = 6666003 / (6 + 6 + 6 + 6 + 0 + 0 + 3).

It is a Duffinian number.

6666003 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123418 + ... + 123471.

It is an arithmetic number, because the mean of its divisors is an integer number (1234450).

Almost surely, 2^6666003 is an apocalyptic number.

6666003 is a deficient number, since it is larger than the sum of its proper divisors (3209597).

6666003 is a wasteful number, since it uses less digits than its factorization.

6666003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246898 (or 246892 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 6666003 is about 2581.8603757756. The cubic root of 6666003 is about 188.2009602265.

The spelling of 6666003 in words is "six million, six hundred sixty-six thousand, three".