664425005 has 4 divisors (see below), whose sum is σ = 797310012. Its totient is φ = 531540000.

The previous prime is 664424977. The next prime is 664425007. The reversal of 664425005 is 500524466.

664425005 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.

It can be written as a sum of positive squares in 2 ways, for example, as 82119844 + 582305161 = 9062^2 + 24131^2 .

It is not a de Polignac number, because 664425005 - 2⁶ = 664424941 is a prime.

It is a super-4 number, since 4×664425005⁴ (a number of 36 digits) contains 4444 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 (664425007) 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, 66442496 + ... + 66442505.

It is an arithmetic number, because the mean of its divisors is an integer number (199327503).

Almost surely, 2^664425005 is an apocalyptic number.

It is an amenable number.

664425005 is a deficient number, since it is larger than the sum of its proper divisors (132885007).

664425005 is a wasteful number, since it uses less digits than its factorization.

664425005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132885006.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 664425005 is about 25776.4428306157. The cubic root of 664425005 is about 872.6002293156.

The spelling of 664425005 in words is "six hundred sixty-four million, four hundred twenty-five thousand, five".