668880016 has 40 divisors (see below), whose sum is σ = 1487672640. Its totient is φ = 285389184.

The previous prime is 668880001. The next prime is 668880029. The reversal of 668880016 is 610088866.

It is a happy number.

668880016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 12270 + ... + 38578.

It is an arithmetic number, because the mean of its divisors is an integer number (37191816).

Almost surely, 2^668880016 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 668880016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743836320).

668880016 is an abundant number, since it is smaller than the sum of its proper divisors (818792624).

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

668880016 is a wasteful number, since it uses less digits than its factorization.

668880016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26551 (or 26545 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 668880016 is about 25862.7147840284. The cubic root of 668880016 is about 874.5461661758.

The spelling of 668880016 in words is "six hundred sixty-eight million, eight hundred eighty thousand, sixteen".