668168501 has 16 divisors (see below), whose sum is σ = 897122688. Its totient is φ = 480600000.

The previous prime is 668168477. The next prime is 668168521. The reversal of 668168501 is 105861866.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 668168501 - 2⁶ = 668168437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668168521) 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 15 ways as a sum of consecutive naturals, for example, 332750 + ... + 334751.

It is an arithmetic number, because the mean of its divisors is an integer number (56070168).

Almost surely, 2^668168501 is an apocalyptic number.

It is an amenable number.

668168501 is a deficient number, since it is larger than the sum of its proper divisors (228954187).

668168501 is a wasteful number, since it uses less digits than its factorization.

668168501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667532.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 668168501 is about 25848.9555108132. The cubic root of 668168501 is about 874.2359593277.

The spelling of 668168501 in words is "six hundred sixty-eight million, one hundred sixty-eight thousand, five hundred one".