6640118 has 4 divisors (see below), whose sum is σ = 9960180. Its totient is φ = 3320058.

The previous prime is 6640111. The next prime is 6640121. The reversal of 6640118 is 8110466.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640111) 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 as a sum of consecutive naturals, namely, 1660028 + ... + 1660031.

It is an arithmetic number, because the mean of its divisors is an integer number (2490045).

Almost surely, 2^6640118 is an apocalyptic number.

6640118 is a deficient number, since it is larger than the sum of its proper divisors (3320062).

6640118 is a wasteful number, since it uses less digits than its factorization.

6640118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320061.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 6640118 is about 2576.8426416838. The cubic root of 6640118 is about 187.9570408860.

The spelling of 6640118 in words is "six million, six hundred forty thousand, one hundred eighteen".