6645009 has 8 divisors (see below), whose sum is σ = 10125760. Its totient is φ = 3797136.

The previous prime is 6644983. The next prime is 6645013. The reversal of 6645009 is 9005466.

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

It is not a de Polignac number, because 6645009 - 2⁸ = 6644753 is a prime.

It is a super-2 number, since 2×6645009² = 88312289220162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

6645009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6645019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158194 + ... + 158235.

It is an arithmetic number, because the mean of its divisors is an integer number (1265720).

Almost surely, 2^6645009 is an apocalyptic number.

It is an amenable number.

6645009 is a deficient number, since it is larger than the sum of its proper divisors (3480751).

6645009 is a wasteful number, since it uses less digits than its factorization.

6645009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316439.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6645009 is about 2577.7914966110. The cubic root of 6645009 is about 188.0031782321.

The spelling of 6645009 in words is "six million, six hundred forty-five thousand, nine".