6643418 has 4 divisors (see below), whose sum is σ = 9965130. Its totient is φ = 3321708.

The previous prime is 6643411. The next prime is 6643423. The reversal of 6643418 is 8143466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8143466 = 2 ⋅4071733.

It can be written as a sum of positive squares in only one way, i.e., 3485689 + 3157729 = 1867^2 + 1777^2 .

It is not an unprimeable number, because it can be changed into a prime (6643411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660853 + ... + 1660856.

Almost surely, 2^6643418 is an apocalyptic number.

6643418 is a deficient number, since it is larger than the sum of its proper divisors (3321712).

6643418 is a wasteful number, since it uses less digits than its factorization.

6643418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321711.

The product of its digits is 13824, while the sum is 32.

The square root of 6643418 is about 2577.4828806415. The cubic root of 6643418 is about 187.9881726376.

The spelling of 6643418 in words is "six million, six hundred forty-three thousand, four hundred eighteen".