666930816 has 96 divisors (see below), whose sum is σ = 2002684320. Its totient is φ = 212636160.

The previous prime is 666930773. The next prime is 666930827. The reversal of 666930816 is 618039666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13911 + ... + 39081.

It is an arithmetic number, because the mean of its divisors is an integer number (20861295).

Almost surely, 2^666930816 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 666930816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001342160).

666930816 is an abundant number, since it is smaller than the sum of its proper divisors (1335753504).

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

666930816 is a wasteful number, since it uses less digits than its factorization.

666930816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25214 (or 25199 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 666930816 is about 25825.0036979668. The cubic root of 666930816 is about 873.6958273498.

The spelling of 666930816 in words is "six hundred sixty-six million, nine hundred thirty thousand, eight hundred sixteen".