668266172 has 12 divisors (see below), whose sum is σ = 1336532400. Its totient is φ = 286399776.

The previous prime is 668266121. The next prime is 668266177. The reversal of 668266172 is 271662866.

668266172 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668266177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11933297 + ... + 11933352.

It is an arithmetic number, because the mean of its divisors is an integer number (111377700).

Almost surely, 2^668266172 is an apocalyptic number.

It is an amenable number.

668266172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

668266172 is a wasteful number, since it uses less digits than its factorization.

668266172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23866660 (or 23866658 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 668266172 is about 25850.8447057345. The cubic root of 668266172 is about 874.2785550402.

The spelling of 668266172 in words is "six hundred sixty-eight million, two hundred sixty-six thousand, one hundred seventy-two".