668875825 has 12 divisors (see below), whose sum is σ = 851823580. Its totient is φ = 520637760.

The previous prime is 668875813. The next prime is 668875841. The reversal of 668875825 is 528578866.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14130081 + 654745744 = 3759^2 + 25588^2 .

It is not a de Polignac number, because 668875825 - 2¹⁷ = 668744753 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 360630 + ... + 362479.

Almost surely, 2^668875825 is an apocalyptic number.

It is an amenable number.

668875825 is a deficient number, since it is larger than the sum of its proper divisors (182947755).

668875825 is a wasteful number, since it uses less digits than its factorization.

668875825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723156 (or 723151 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 55.

The square root of 668875825 is about 25862.6337599248. The cubic root of 668875825 is about 874.5443396246.

The spelling of 668875825 in words is "six hundred sixty-eight million, eight hundred seventy-five thousand, eight hundred twenty-five".