664223085 has 20 divisors (see below), whose sum is σ = 1190682108. Its totient is φ = 354252096.

The previous prime is 664223011. The next prime is 664223093. The reversal of 664223085 is 580322466.

664223085 is a `hidden beast` number, since 6 + 642 + 2 + 3 + 0 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 483428169 + 180794916 = 21987^2 + 13446^2 .

It is not a de Polignac number, because 664223085 - 2¹⁴ = 664206701 is a prime.

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 19 ways as a sum of consecutive naturals, for example, 819624 + ... + 820433.

Almost surely, 2^664223085 is an apocalyptic number.

It is an amenable number.

664223085 is a deficient number, since it is larger than the sum of its proper divisors (526459023).

664223085 is a wasteful number, since it uses less digits than its factorization.

664223085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640074 (or 1640065 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 664223085 is about 25772.5257784331. The cubic root of 664223085 is about 872.5118254131.

The spelling of 664223085 in words is "six hundred sixty-four million, two hundred twenty-three thousand, eighty-five".