664669933 has 4 divisors (see below), whose sum is σ = 664740700. Its totient is φ = 664599168.

The previous prime is 664669921. The next prime is 664670003. The reversal of 664669933 is 339966466.

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 494706564 + 169963369 = 22242^2 + 13037^2 .

It is a cyclic number.

It is not a de Polignac number, because 664669933 - 2¹³ = 664661741 is a prime.

It is a super-2 number, since 2×664669933² = 883572239668448978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664669133) 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, 18660 + ... + 40957.

It is an arithmetic number, because the mean of its divisors is an integer number (166185175).

Almost surely, 2^664669933 is an apocalyptic number.

It is an amenable number.

664669933 is a deficient number, since it is larger than the sum of its proper divisors (70767).

664669933 is a wasteful number, since it uses less digits than its factorization.

664669933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70766.

The product of its digits is 3779136, while the sum is 52.

The square root of 664669933 is about 25781.1933975136. The cubic root of 664669933 is about 872.7074387929.

The spelling of 664669933 in words is "six hundred sixty-four million, six hundred sixty-nine thousand, nine hundred thirty-three".