664686133 has 4 divisors (see below), whose sum is σ = 665087488. Its totient is φ = 664284780.

The previous prime is 664686109. The next prime is 664686199. The reversal of 664686133 is 331686466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331686466 = 2 ⋅165843233.

It is a cyclic number.

It is not a de Polignac number, because 664686133 - 2⁹ = 664685621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664686133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664686103) 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, 198183 + ... + 201508.

It is an arithmetic number, because the mean of its divisors is an integer number (166271872).

Almost surely, 2^664686133 is an apocalyptic number.

It is an amenable number.

664686133 is a deficient number, since it is larger than the sum of its proper divisors (401355).

664686133 is a wasteful number, since it uses less digits than its factorization.

664686133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401354.

The product of its digits is 373248, while the sum is 43.

The square root of 664686133 is about 25781.5075781072. The cubic root of 664686133 is about 872.7145289013.

The spelling of 664686133 in words is "six hundred sixty-four million, six hundred eighty-six thousand, one hundred thirty-three".