666544003 has 8 divisors (see below), whose sum is σ = 673740288. Its totient is φ = 659361864.

The previous prime is 666543967. The next prime is 666544019. The reversal of 666544003 is 300445666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666544003 - 2⁹ = 666543491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666544003.

It is not an unprimeable number, because it can be changed into a prime (666544103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110676 + ... + 116542.

It is an arithmetic number, because the mean of its divisors is an integer number (84217536).

Almost surely, 2^666544003 is an apocalyptic number.

666544003 is a deficient number, since it is larger than the sum of its proper divisors (7196285).

666544003 is a wasteful number, since it uses less digits than its factorization.

666544003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 666544003 is about 25817.5134937507. The cubic root of 666544003 is about 873.5268831584.

Adding to 666544003 its reverse (300445666), we get a palindrome (966989669).

The spelling of 666544003 in words is "six hundred sixty-six million, five hundred forty-four thousand, three".