664113503 has 4 divisors (see below), whose sum is σ = 665190480. Its totient is φ = 663036528.

The previous prime is 664113497. The next prime is 664113521. The reversal of 664113503 is 305311466.

It is a happy number.

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 664113503 - 2¹⁰ = 664112479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664113533) 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 3 ways as a sum of consecutive naturals, for example, 537563 + ... + 538796.

It is an arithmetic number, because the mean of its divisors is an integer number (166297620).

Almost surely, 2^664113503 is an apocalyptic number.

664113503 is a deficient number, since it is larger than the sum of its proper divisors (1076977).

664113503 is a wasteful number, since it uses less digits than its factorization.

664113503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076976.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 664113503 is about 25770.3997446683. The cubic root of 664113503 is about 872.4638411081.

Adding to 664113503 its reverse (305311466), we get a palindrome (969424969).

The spelling of 664113503 in words is "six hundred sixty-four million, one hundred thirteen thousand, five hundred three".