306216666 has 128 divisors (see below), whose sum is σ = 803727360. Its totient is φ = 84623616.

The previous prime is 306216661. The next prime is 306216671. The reversal of 306216666 is 666612603.

It is an interprime number because it is at equal distance from previous prime (306216661) and next prime (306216671).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 306216666.

It is not an unprimeable number, because it can be changed into a prime (306216661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2709826 + ... + 2709938.

It is an arithmetic number, because the mean of its divisors is an integer number (6279120).

Almost surely, 2^306216666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 306216666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401863680).

306216666 is an abundant number, since it is smaller than the sum of its proper divisors (497510694).

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

306216666 is a wasteful number, since it uses less digits than its factorization.

306216666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 306216666 is about 17499.0475740824. The cubic root of 306216666 is about 674.0254182432.

The spelling of 306216666 in words is "three hundred six million, two hundred sixteen thousand, six hundred sixty-six".