664441133 has 4 divisors (see below), whose sum is σ = 664496700. Its totient is φ = 664385568.

The previous prime is 664441111. The next prime is 664441157. The reversal of 664441133 is 331144466.

664441133 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 615188809 + 49252324 = 24803^2 + 7018^2 .

It is a cyclic number.

It is not a de Polignac number, because 664441133 - 2⁸ = 664440877 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 664441133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664441103) 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, 1658 + ... + 36491.

It is an arithmetic number, because the mean of its divisors is an integer number (166124175).

Almost surely, 2^664441133 is an apocalyptic number.

It is an amenable number.

664441133 is a deficient number, since it is larger than the sum of its proper divisors (55567).

664441133 is a wasteful number, since it uses less digits than its factorization.

664441133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55566.

The product of its digits is 20736, while the sum is 32.

The square root of 664441133 is about 25776.7556725046. The cubic root of 664441133 is about 872.6072896472.

Adding to 664441133 its reverse (331144466), we get a palindrome (995585599).

The spelling of 664441133 in words is "six hundred sixty-four million, four hundred forty-one thousand, one hundred thirty-three".