668424168 has 24 divisors (see below), whose sum is σ = 1810315650. Its totient is φ = 222808032.

The previous prime is 668424067. The next prime is 668424191. The reversal of 668424168 is 861424866.

668424168 is a `hidden beast` number, since 6 + 68 + 424 + 168 = 666.

It can be written as a sum of positive squares in only one way, i.e., 666569124 + 1855044 = 25818^2 + 1362^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4641763 + ... + 4641906.

Almost surely, 2^668424168 is an apocalyptic number.

It is an amenable number.

668424168 is an abundant number, since it is smaller than the sum of its proper divisors (1141891482).

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

668424168 is a wasteful number, since it uses less digits than its factorization.

668424168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283681 (or 9283674 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 668424168 is about 25853.9004407459. The cubic root of 668424168 is about 874.3474505571.

The spelling of 668424168 in words is "six hundred sixty-eight million, four hundred twenty-four thousand, one hundred sixty-eight".