667688108 has 6 divisors (see below), whose sum is σ = 1168454196. Its totient is φ = 333844052.

The previous prime is 667688089. The next prime is 667688129. The reversal of 667688108 is 801886766.

667688108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83461010 + ... + 83461017.

It is an arithmetic number, because the mean of its divisors is an integer number (194742366).

Almost surely, 2^667688108 is an apocalyptic number.

It is an amenable number.

667688108 is a deficient number, since it is larger than the sum of its proper divisors (500766088).

667688108 is a wasteful number, since it uses less digits than its factorization.

667688108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166922031 (or 166922029 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 667688108 is about 25839.6615302910. The cubic root of 667688108 is about 874.0263926665.

The spelling of 667688108 in words is "six hundred sixty-seven million, six hundred eighty-eight thousand, one hundred eight".