668941056 has 432 divisors, whose sum is σ = 2423366400. Its totient is φ = 173187072.

The previous prime is 668941043. The next prime is 668941099. The reversal of 668941056 is 650149866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11337955 + ... + 11338013.

Almost surely, 2^668941056 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 668941056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1211683200).

668941056 is an abundant number, since it is smaller than the sum of its proper divisors (1754425344).

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

668941056 is a wasteful number, since it uses less digits than its factorization.

668941056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 668941056 is about 25863.8948343052. The cubic root of 668941056 is about 874.5727681936.

The spelling of 668941056 in words is "six hundred sixty-eight million, nine hundred forty-one thousand, fifty-six".