6665648 has 40 divisors (see below), whose sum is σ = 14250576. Its totient is φ = 3020160.

The previous prime is 6665639. The next prime is 6665669. The reversal of 6665648 is 8465666.

It is a super-3 number, since 3×6665648³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21140 + ... + 21452.

Almost surely, 2^6665648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6665648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7125288).

6665648 is an abundant number, since it is smaller than the sum of its proper divisors (7584928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6665648 is a wasteful number, since it uses less digits than its factorization.

6665648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 326 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 6665648 is about 2581.7916259838. The cubic root of 6665648 is about 188.1976192676.

The spelling of 6665648 in words is "six million, six hundred sixty-five thousand, six hundred forty-eight".