664223405 has 8 divisors (see below), whose sum is σ = 843954552. Its totient is φ = 500121088.

The previous prime is 664223393. The next prime is 664223419. The reversal of 664223405 is 504322466.

It can be written as a sum of positive squares in 4 ways, for example, as 53787556 + 610435849 = 7334^2 + 24707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664223405 - 2⁶ = 664223341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3907112 + ... + 3907281.

It is an arithmetic number, because the mean of its divisors is an integer number (105494319).

Almost surely, 2^664223405 is an apocalyptic number.

It is an amenable number.

664223405 is a deficient number, since it is larger than the sum of its proper divisors (179731147).

664223405 is a wasteful number, since it uses less digits than its factorization.

664223405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7814415.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 664223405 is about 25772.5319865938. The cubic root of 664223405 is about 872.5119655286.

The spelling of 664223405 in words is "six hundred sixty-four million, two hundred twenty-three thousand, four hundred five".