664402605 has 8 divisors (see below), whose sum is σ = 1063044192. Its totient is φ = 354348048.

The previous prime is 664402603. The next prime is 664402631. The reversal of 664402605 is 506204466.

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

It is not a de Polignac number, because 664402605 - 2¹ = 664402603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664402601) 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 7 ways as a sum of consecutive naturals, for example, 22146739 + ... + 22146768.

It is an arithmetic number, because the mean of its divisors is an integer number (132880524).

Almost surely, 2^664402605 is an apocalyptic number.

It is an amenable number.

664402605 is a deficient number, since it is larger than the sum of its proper divisors (398641587).

664402605 is a wasteful number, since it uses less digits than its factorization.

664402605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44293515.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 664402605 is about 25776.0083216933. The cubic root of 664402605 is about 872.5904231099.

The spelling of 664402605 in words is "six hundred sixty-four million, four hundred two thousand, six hundred five".