9666660 has 48 divisors (see below), whose sum is σ = 27449856. Its totient is φ = 2541312.

The previous prime is 9666623. The next prime is 9666661. The reversal of 9666660 is 666669.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9666661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3277 + ... + 5483.

It is an arithmetic number, because the mean of its divisors is an integer number (571872).

Almost surely, 2^9666660 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 9666660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13724928).

9666660 is an abundant number, since it is smaller than the sum of its proper divisors (17783196).

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

9666660 is a wasteful number, since it uses less digits than its factorization.

9666660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 9666660 is about 3109.1252789169. The cubic root of 9666660 is about 213.0225019759.

It can be divided in two parts, 966 and 6660, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 9666660 in words is "nine million, six hundred sixty-six thousand, six hundred sixty".