668051256852 has 144 divisors (see below), whose sum is σ = 2046637337472. Its totient is φ = 179363911680.

The previous prime is 668051256811. The next prime is 668051256853. The reversal of 668051256852 is 258652150866.

It is a happy number.

668051256852 is a `hidden beast` number, since 6 + 68 + 0 + 5 + 12 + 568 + 5 + 2 = 666.

668051256852 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668051256853) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2633352 + ... + 2875872.

It is an arithmetic number, because the mean of its divisors is an integer number (14212759288).

Almost surely, 2^668051256852 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 668051256852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023318668736).

668051256852 is an abundant number, since it is smaller than the sum of its proper divisors (1378586080620).

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

668051256852 is a wasteful number, since it uses less digits than its factorization.

668051256852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243198 (or 243193 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

The spelling of 668051256852 in words is "six hundred sixty-eight billion, fifty-one million, two hundred fifty-six thousand, eight hundred fifty-two".