668268660 has 24 divisors (see below), whose sum is σ = 1871152416. Its totient is φ = 178204960.

The previous prime is 668268649. The next prime is 668268661. The reversal of 668268660 is 66862866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668268661) 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 7 ways as a sum of consecutive naturals, for example, 5568846 + ... + 5568965.

It is an arithmetic number, because the mean of its divisors is an integer number (77964684).

Almost surely, 2^668268660 is an apocalyptic number.

668268660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668268660 is an abundant number, since it is smaller than the sum of its proper divisors (1202883756).

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

668268660 is a wasteful number, since it uses less digits than its factorization.

668268660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137823 (or 11137821 counting only the distinct ones).

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

The square root of 668268660 is about 25850.8928279083. The cubic root of 668268660 is about 874.2796400382.

The spelling of 668268660 in words is "six hundred sixty-eight million, two hundred sixty-eight thousand, six hundred sixty".