6665660 has 12 divisors (see below), whose sum is σ = 13997928. Its totient is φ = 2666256.

The previous prime is 6665639. The next prime is 6665669. The reversal of 6665660 is 665666.

It is a self number, because there is not a number n which added to its sum of digits gives 6665660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166622 + ... + 166661.

It is an arithmetic number, because the mean of its divisors is an integer number (1166494).

Almost surely, 2^6665660 is an apocalyptic number.

It is an amenable number.

6665660 is an abundant number, since it is smaller than the sum of its proper divisors (7332268).

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

6665660 is a wasteful number, since it uses less digits than its factorization.

6665660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333292 (or 333290 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 6665660 is about 2581.7939499503. The cubic root of 6665660 is about 188.1977322033.

The spelling of 6665660 in words is "six million, six hundred sixty-five thousand, six hundred sixty".