660443984 has 10 divisors (see below), whose sum is σ = 1279610250. Its totient is φ = 330221984.

The previous prime is 660443963. The next prime is 660443989. The reversal of 660443984 is 489344066.

660443984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 659051584 + 1392400 = 25672^2 + 1180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660443989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20638859 + ... + 20638890.

It is an arithmetic number, because the mean of its divisors is an integer number (127961025).

Almost surely, 2^660443984 is an apocalyptic number.

It is an amenable number.

660443984 is a deficient number, since it is larger than the sum of its proper divisors (619166266).

660443984 is a wasteful number, since it uses less digits than its factorization.

660443984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41277757 (or 41277751 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The square root of 660443984 is about 25699.1047314882. The cubic root of 660443984 is about 870.8539569535.

The spelling of 660443984 in words is "six hundred sixty million, four hundred forty-three thousand, nine hundred eighty-four".