6665889 has 8 divisors (see below), whose sum is σ = 8933760. Its totient is φ = 4420976.

The previous prime is 6665881. The next prime is 6665909. The reversal of 6665889 is 9885666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6665889 - 2³ = 6665881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5049 + ... + 6230.

It is an arithmetic number, because the mean of its divisors is an integer number (1116720).

Almost surely, 2^6665889 is an apocalyptic number.

It is an amenable number.

6665889 is a deficient number, since it is larger than the sum of its proper divisors (2267871).

6665889 is a wasteful number, since it uses less digits than its factorization.

6665889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11479.

The product of its digits is 622080, while the sum is 48.

The square root of 6665889 is about 2581.8382985772. The cubic root of 6665889 is about 188.1998873681.

It can be divided in two parts, 666 and 5889, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 6665889 in words is "six million, six hundred sixty-five thousand, eight hundred eighty-nine".