664066009 has 4 divisors (see below), whose sum is σ = 666412816. Its totient is φ = 661719204.

The previous prime is 664066003. The next prime is 664066037. The reversal of 664066009 is 900660466.

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 664066009 - 2³ = 664066001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664066001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172979 + ... + 1173544.

It is an arithmetic number, because the mean of its divisors is an integer number (166603204).

Almost surely, 2^664066009 is an apocalyptic number.

It is an amenable number.

664066009 is a deficient number, since it is larger than the sum of its proper divisors (2346807).

664066009 is a wasteful number, since it uses less digits than its factorization.

664066009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346806.

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

The square root of 664066009 is about 25769.4782446211. The cubic root of 664066009 is about 872.4430425623.

The spelling of 664066009 in words is "six hundred sixty-four million, sixty-six thousand, nine".