665584905216 has 1056 divisors, whose sum is σ = 2423756998656. Its totient is φ = 158308761600.

The previous prime is 665584905191. The next prime is 665584905239. The reversal of 665584905216 is 612509485566.

It is a tau number, because it is divible by the number of its divisors (1056).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1813582665 + ... + 1813583031.

Almost surely, 2^665584905216 is an apocalyptic number.

665584905216 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665584905216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1211878499328).

665584905216 is an abundant number, since it is smaller than the sum of its proper divisors (1758172093440).

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

665584905216 is a wasteful number, since it uses less digits than its factorization.

665584905216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 57.

The spelling of 665584905216 in words is "six hundred sixty-five billion, five hundred eighty-four million, nine hundred five thousand, two hundred sixteen".