665316684 has 72 divisors (see below), whose sum is σ = 1733204928. Its totient is φ = 215032320.

The previous prime is 665316679. The next prime is 665316703. The reversal of 665316684 is 486613566.

It is a super-3 number, since 3×665316684³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 488164 + ... + 489524.

Almost surely, 2^665316684 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 665316684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866602464).

665316684 is an abundant number, since it is smaller than the sum of its proper divisors (1067888244).

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

665316684 is a wasteful number, since it uses less digits than its factorization.

665316684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775 (or 1770 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 665316684 is about 25793.7334250007. The cubic root of 665316684 is about 872.9904070304.

The spelling of 665316684 in words is "six hundred sixty-five million, three hundred sixteen thousand, six hundred eighty-four".