664038433 has 4 divisors (see below), whose sum is σ = 686936340. Its totient is φ = 641140528.

The previous prime is 664038409. The next prime is 664038437. The reversal of 664038433 is 334830466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 226893969 + 437144464 = 15063^2 + 20908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664038433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664038392 and 664038401.

It is not an unprimeable number, because it can be changed into a prime (664038437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11448910 + ... + 11448967.

It is an arithmetic number, because the mean of its divisors is an integer number (171734085).

Almost surely, 2^664038433 is an apocalyptic number.

It is an amenable number.

664038433 is a deficient number, since it is larger than the sum of its proper divisors (22897907).

664038433 is a wasteful number, since it uses less digits than its factorization.

664038433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22897906.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 664038433 is about 25768.9431874883. The cubic root of 664038433 is about 872.4309660407.

Adding to 664038433 its reverse (334830466), we get a palindrome (998868899).

The spelling of 664038433 in words is "six hundred sixty-four million, thirty-eight thousand, four hundred thirty-three".