664242606 has 20 divisors (see below), whose sum is σ = 1488395832. Its totient is φ = 221414148.

The previous prime is 664242583. The next prime is 664242643. The reversal of 664242606 is 606242466.

664242606 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 42 + 606 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2049970 + ... + 2050293.

Almost surely, 2^664242606 is an apocalyptic number.

664242606 is an abundant number, since it is smaller than the sum of its proper divisors (824153226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664242606 is a wasteful number, since it uses less digits than its factorization.

664242606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100277 (or 4100268 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 664242606 is about 25772.9044928972. The cubic root of 664242606 is about 872.5203728108.

The spelling of 664242606 in words is "six hundred sixty-four million, two hundred forty-two thousand, six hundred six".