668036648 has 16 divisors (see below), whose sum is σ = 1281698880. Its totient is φ = 326250288.

The previous prime is 668036647. The next prime is 668036669. The reversal of 668036648 is 846630866.

668036648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (668036647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970640 + ... + 971327.

It is an arithmetic number, because the mean of its divisors is an integer number (80106180).

Almost surely, 2^668036648 is an apocalyptic number.

It is an amenable number.

668036648 is a deficient number, since it is larger than the sum of its proper divisors (613662232).

668036648 is a wasteful number, since it uses less digits than its factorization.

668036648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942016 (or 1942012 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 668036648 is about 25846.4049337621. The cubic root of 668036648 is about 874.1784497739.

The spelling of 668036648 in words is "six hundred sixty-eight million, thirty-six thousand, six hundred forty-eight".