664002005 has 8 divisors (see below), whose sum is σ = 797088600. Its totient is φ = 531010816.

The previous prime is 664001993. The next prime is 664002023. The reversal of 664002005 is 500200466.

It can be written as a sum of positive squares in 4 ways, for example, as 8334769 + 655667236 = 2887^2 + 25606^2 .

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 664002005 - 2¹⁸ = 663739861 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 7 ways as a sum of consecutive naturals, for example, 7520 + ... + 37209.

It is an arithmetic number, because the mean of its divisors is an integer number (99636075).

Almost surely, 2^664002005 is an apocalyptic number.

It is an amenable number.

664002005 is a deficient number, since it is larger than the sum of its proper divisors (133086595).

664002005 is a wasteful number, since it uses less digits than its factorization.

664002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47703.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 664002005 is about 25768.2363579660. The cubic root of 664002005 is about 872.4150123977.

The spelling of 664002005 in words is "six hundred sixty-four million, two thousand, five".