660664668 has 24 divisors (see below), whose sum is σ = 1553692672. Its totient is φ = 218487024.

The previous prime is 660664657. The next prime is 660664681. The reversal of 660664668 is 866466066.

660664668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215230 + ... + 218277.

Almost surely, 2^660664668 is an apocalyptic number.

It is an amenable number.

660664668 is an abundant number, since it is smaller than the sum of its proper divisors (893028004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660664668 is a wasteful number, since it uses less digits than its factorization.

660664668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433641 (or 433639 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The square root of 660664668 is about 25703.3979854804. The cubic root of 660664668 is about 870.9509432928.

The spelling of 660664668 in words is "six hundred sixty million, six hundred sixty-four thousand, six hundred sixty-eight".