665316 has 18 divisors (see below), whose sum is σ = 1681862. Its totient is φ = 221760.

The previous prime is 665311. The next prime is 665351. The reversal of 665316 is 613566.

665316 is a `hidden beast` number, since 6 + 653 + 1 + 6 = 666.

665316 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 9216 = 810^2 + 96^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 665316.

It is not an unprimeable number, because it can be changed into a prime (665311) by changing a digit.

665316 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9205 + ... + 9276.

2⁶⁶⁵³¹⁶ is an apocalyptic number.

It is an amenable number.

665316 is an abundant number, since it is smaller than the sum of its proper divisors (1016546).

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

665316 is a wasteful number, since it uses less digits than its factorization.

665316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18491 (or 18486 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 665316 is about 815.6690505346. The cubic root of 665316 is about 87.2990107862.

The spelling of 665316 in words is "six hundred sixty-five thousand, three hundred sixteen".