6661318 has 4 divisors (see below), whose sum is σ = 9991980. Its totient is φ = 3330658.

The previous prime is 6661313. The next prime is 6661327. The reversal of 6661318 is 8131666.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6661318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661313) 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 as a sum of consecutive naturals, namely, 1665328 + ... + 1665331.

It is an arithmetic number, because the mean of its divisors is an integer number (2497995).

Almost surely, 2^6661318 is an apocalyptic number.

6661318 is a deficient number, since it is larger than the sum of its proper divisors (3330662).

6661318 is a wasteful number, since it uses less digits than its factorization.

6661318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330661.

The product of its digits is 5184, while the sum is 31.

The square root of 6661318 is about 2580.9529247935. The cubic root of 6661318 is about 188.1568594291.

The spelling of 6661318 in words is "six million, six hundred sixty-one thousand, three hundred eighteen".