9966666 has 8 divisors (see below), whose sum is σ = 19933344. Its totient is φ = 3322220.

The previous prime is 9966643. The next prime is 9966667. The reversal of 9966666 is 6666699.

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

9966666 is an admirable number.

It is an Ulam number.

9966666 is a modest number, since divided by 6666 gives 996 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9966667) 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, 830550 + ... + 830561.

It is an arithmetic number, because the mean of its divisors is an integer number (2491668).

Almost surely, 2^9966666 is an apocalyptic number.

9966666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9966666 is a wasteful number, since it uses less digits than its factorization.

9966666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661116.

The product of its digits is 629856, while the sum is 48.

The square root of 9966666 is about 3157.0026924284. The cubic root of 9966666 is about 215.2038160994.

The spelling of 9966666 in words is "nine million, nine hundred sixty-six thousand, six hundred sixty-six".