668753608 has 16 divisors (see below), whose sum is σ = 1254882060. Its totient is φ = 334118400.

The previous prime is 668753573. The next prime is 668753611. The reversal of 668753608 is 806357866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 666569124 + 2184484 = 25818^2 + 1478^2 .

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 3 ways as a sum of consecutive naturals, for example, 21073 + ... + 42208.

Almost surely, 2^668753608 is an apocalyptic number.

It is an amenable number.

668753608 is a deficient number, since it is larger than the sum of its proper divisors (586128452).

668753608 is a wasteful number, since it uses less digits than its factorization.

668753608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64608 (or 64604 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 668753608 is about 25860.2708415825. The cubic root of 668753608 is about 874.4910707955.

The spelling of 668753608 in words is "six hundred sixty-eight million, seven hundred fifty-three thousand, six hundred eight".