6660680 has 32 divisors (see below), whose sum is σ = 16140600. Its totient is φ = 2459136.

The previous prime is 6660679. The next prime is 6660707. The reversal of 6660680 is 860666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3541924 + 3118756 = 1882^2 + 1766^2 .

It is an Ulam 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, 5885 + ... + 6924.

Almost surely, 2^6660680 is an apocalyptic number.

It is an amenable number.

6660680 is an abundant number, since it is smaller than the sum of its proper divisors (9479920).

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

6660680 is a wasteful number, since it uses less digits than its factorization.

6660680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12833 (or 12829 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 6660680 is about 2580.8293240739. The cubic root of 6660680 is about 188.1508522141.

It can be divided in two parts, 66606 and 80, that multiplied together give a triangular number (5328480 = T₃₂₆₄).

The spelling of 6660680 in words is "six million, six hundred sixty thousand, six hundred eighty".