6643199 has 4 divisors (see below), whose sum is σ = 6797736. Its totient is φ = 6488664.

The previous prime is 6643181. The next prime is 6643201. The reversal of 6643199 is 9913466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9913466 = 2 ⋅4956733.

It is a cyclic number.

It is not a de Polignac number, because 6643199 - 2¹⁶ = 6577663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77204 + ... + 77289.

It is an arithmetic number, because the mean of its divisors is an integer number (1699434).

Almost surely, 2^6643199 is an apocalyptic number.

6643199 is a deficient number, since it is larger than the sum of its proper divisors (154537).

6643199 is a wasteful number, since it uses less digits than its factorization.

6643199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154536.

The product of its digits is 34992, while the sum is 38.

The square root of 6643199 is about 2577.4403969830. The cubic root of 6643199 is about 187.9861069407.

The spelling of 6643199 in words is "six million, six hundred forty-three thousand, one hundred ninety-nine".