666450320 has 80 divisors (see below), whose sum is σ = 1661679360. Its totient is φ = 247683072.

The previous prime is 666450319. The next prime is 666450331. The reversal of 666450320 is 23054666.

666450320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104339 + ... + 110541.

It is an arithmetic number, because the mean of its divisors is an integer number (20770992).

Almost surely, 2^666450320 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 666450320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830839680).

666450320 is an abundant number, since it is smaller than the sum of its proper divisors (995229040).

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

666450320 is a wasteful number, since it uses less digits than its factorization.

666450320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6312 (or 6306 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 666450320 is about 25815.6990995789. The cubic root of 666450320 is about 873.4859564015.

The spelling of 666450320 in words is "six hundred sixty-six million, four hundred fifty thousand, three hundred twenty".