6640109 has 8 divisors (see below), whose sum is σ = 7620288. Its totient is φ = 5667840.

The previous prime is 6640093. The next prime is 6640111. The reversal of 6640109 is 9010466.

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

It is a cyclic number.

It is not a de Polignac number, because 6640109 - 2⁴ = 6640093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (952536).

Almost surely, 2^6640109 is an apocalyptic number.

It is an amenable number.

6640109 is a deficient number, since it is larger than the sum of its proper divisors (980179).

6640109 is a wasteful number, since it uses less digits than its factorization.

6640109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 6640109 is about 2576.8408953601. The cubic root of 6640109 is about 187.9569559671.

The spelling of 6640109 in words is "six million, six hundred forty thousand, one hundred nine".