666216896 has 56 divisors (see below), whose sum is σ = 1383792000. Its totient is φ = 317636352.

The previous prime is 666216883. The next prime is 666216917. The reversal of 666216896 is 698612666.

666216896 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 7 ways as a sum of consecutive naturals, for example, 734075 + ... + 734981.

Almost surely, 2^666216896 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 666216896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691896000).

666216896 is an abundant number, since it is smaller than the sum of its proper divisors (717575104).

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

666216896 is a wasteful number, since it uses less digits than its factorization.

666216896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 1431 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 666216896 is about 25811.1777336874. The cubic root of 666216896 is about 873.3839651058.

The spelling of 666216896 in words is "six hundred sixty-six million, two hundred sixteen thousand, eight hundred ninety-six".