664044403 has 4 divisors (see below), whose sum is σ = 724412088. Its totient is φ = 603676720.

The previous prime is 664044391. The next prime is 664044421. The reversal of 664044403 is 304440466.

664044403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664044403 - 2¹³ = 664036211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664044103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30183826 + ... + 30183847.

It is an arithmetic number, because the mean of its divisors is an integer number (181103022).

Almost surely, 2^664044403 is an apocalyptic number.

664044403 is a deficient number, since it is larger than the sum of its proper divisors (60367685).

664044403 is a wasteful number, since it uses less digits than its factorization.

664044403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60367684.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 664044403 is about 25769.0590243416. The cubic root of 664044403 is about 872.4335805467.

Adding to 664044403 its reverse (304440466), we get a palindrome (968484869).

It can be divided in two parts, 66404 and 4403, that added together give a palindrome (70807).

The spelling of 664044403 in words is "six hundred sixty-four million, forty-four thousand, four hundred three".