668129903 has 16 divisors (see below), whose sum is σ = 809293824. Its totient is φ = 538462080.

The previous prime is 668129899. The next prime is 668129911. The reversal of 668129903 is 309921866.

It is not a de Polignac number, because 668129903 - 2² = 668129899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668129953) 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 15 ways as a sum of consecutive naturals, for example, 155798 + ... + 160028.

It is an arithmetic number, because the mean of its divisors is an integer number (50580864).

Almost surely, 2^668129903 is an apocalyptic number.

668129903 is a deficient number, since it is larger than the sum of its proper divisors (141163921).

668129903 is a wasteful number, since it uses less digits than its factorization.

668129903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 668129903 is about 25848.2088934611. The cubic root of 668129903 is about 874.2191250465.

The spelling of 668129903 in words is "six hundred sixty-eight million, one hundred twenty-nine thousand, nine hundred three".