664238683 has 4 divisors (see below), whose sum is σ = 664293960. Its totient is φ = 664183408.

The previous prime is 664238681. The next prime is 664238711. The reversal of 664238683 is 386832466.

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 is a cyclic number.

It is not a de Polignac number, because 664238683 - 2¹ = 664238681 is a prime.

It is a super-4 number, since 4×664238683⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664238681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1153 + ... + 36466.

It is an arithmetic number, because the mean of its divisors is an integer number (166073490).

Almost surely, 2^664238683 is an apocalyptic number.

664238683 is a deficient number, since it is larger than the sum of its proper divisors (55277).

664238683 is a wasteful number, since it uses less digits than its factorization.

664238683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55276.

The product of its digits is 995328, while the sum is 46.

The square root of 664238683 is about 25772.8283857244. The cubic root of 664238683 is about 872.5186551130.

The spelling of 664238683 in words is "six hundred sixty-four million, two hundred thirty-eight thousand, six hundred eighty-three".