660693216 has 96 divisors (see below), whose sum is σ = 1834963200. Its totient is φ = 207719424.

The previous prime is 660693199. The next prime is 660693227. The reversal of 660693216 is 612396066.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159135 + ... + 163233.

It is an arithmetic number, because the mean of its divisors is an integer number (19114200).

Almost surely, 2^660693216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660693216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917481600).

660693216 is an abundant number, since it is smaller than the sum of its proper divisors (1174269984).

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

660693216 is a wasteful number, since it uses less digits than its factorization.

660693216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208 (or 4200 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 660693216 is about 25703.9533146168. The cubic root of 660693216 is about 870.9634880075.

The spelling of 660693216 in words is "six hundred sixty million, six hundred ninety-three thousand, two hundred sixteen".