668286660 has 96 divisors (see below), whose sum is σ = 2000823552. Its totient is φ = 166072320.

The previous prime is 668286631. The next prime is 668286667. The reversal of 668286660 is 66682866.

It is not an unprimeable number, because it can be changed into a prime (668286667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101880 + ... + 108240.

It is an arithmetic number, because the mean of its divisors is an integer number (20841912).

Almost surely, 2^668286660 is an apocalyptic number.

668286660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668286660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000411776).

668286660 is an abundant number, since it is smaller than the sum of its proper divisors (1332536892).

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

668286660 is a wasteful number, since it uses less digits than its factorization.

668286660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6493 (or 6491 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 668286660 is about 25851.2409760151. The cubic root of 668286660 is about 874.2874896219.

The spelling of 668286660 in words is "six hundred sixty-eight million, two hundred eighty-six thousand, six hundred sixty".