6663889 has 4 divisors (see below), whose sum is σ = 7014640. Its totient is φ = 6313140.

The previous prime is 6663869. The next prime is 6663893. The reversal of 6663889 is 9883666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6663889 - 2⁵ = 6663857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6663809) 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 3 ways as a sum of consecutive naturals, for example, 175347 + ... + 175384.

It is an arithmetic number, because the mean of its divisors is an integer number (1753660).

Almost surely, 2^6663889 is an apocalyptic number.

It is an amenable number.

6663889 is a deficient number, since it is larger than the sum of its proper divisors (350751).

6663889 is a wasteful number, since it uses less digits than its factorization.

6663889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350750.

The product of its digits is 373248, while the sum is 46.

The square root of 6663889 is about 2581.4509485946. The cubic root of 6663889 is about 188.1810633010.

The spelling of 6663889 in words is "six million, six hundred sixty-three thousand, eight hundred eighty-nine".