666573408 has 192 divisors, whose sum is σ = 2059223040. Its totient is φ = 209433600.

The previous prime is 666573361. The next prime is 666573431. The reversal of 666573408 is 804375666.

666573408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1097841 + ... + 1098447.

It is an arithmetic number, because the mean of its divisors is an integer number (10725120).

Almost surely, 2^666573408 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 666573408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1029611520).

666573408 is an abundant number, since it is smaller than the sum of its proper divisors (1392649632).

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

666573408 is a wasteful number, since it uses less digits than its factorization.

666573408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 666573408 is about 25818.0829652397. The cubic root of 666573408 is about 873.5397283620.

The spelling of 666573408 in words is "six hundred sixty-six million, five hundred seventy-three thousand, four hundred eight".