6664609 has 4 divisors (see below), whose sum is σ = 7616704. Its totient is φ = 5712516.

The previous prime is 6664607. The next prime is 6664631. The reversal of 6664609 is 9064666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6664609 - 2¹ = 6664607 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476037 + ... + 476050.

It is an arithmetic number, because the mean of its divisors is an integer number (1904176).

Almost surely, 2^6664609 is an apocalyptic number.

It is an amenable number.

6664609 is a deficient number, since it is larger than the sum of its proper divisors (952095).

6664609 is an equidigital number, since it uses as much as digits as its factorization.

6664609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952094.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 6664609 is about 2581.5904012837. The cubic root of 6664609 is about 188.1878403990.

The spelling of 6664609 in words is "six million, six hundred sixty-four thousand, six hundred nine".