6660003 has 16 divisors (see below), whose sum is σ = 10273536. Its totient is φ = 3758880.

The previous prime is 6659977. The next prime is 6660011. The reversal of 6660003 is 3000666.

It is not a de Polignac number, because 6660003 - 2⁹ = 6659491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6660023) 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, 168 + ... + 3653.

It is an arithmetic number, because the mean of its divisors is an integer number (642096).

Almost surely, 2^6660003 is an apocalyptic number.

6660003 is a deficient number, since it is larger than the sum of its proper divisors (3613533).

6660003 is a wasteful number, since it uses less digits than its factorization.

6660003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 6660003 is about 2580.6981613509. The cubic root of 6660003 is about 188.1444773673.

Adding to 6660003 its reverse (3000666), we get a palindrome (9660669).

The spelling of 6660003 in words is "six million, six hundred sixty thousand, three".