665305 has 8 divisors (see below), whose sum is σ = 802944. Its totient is φ = 529200.

The previous prime is 665303. The next prime is 665311. The reversal of 665305 is 503566.

665305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665305 - 2¹ = 665303 is a prime.

It is a super-3 number, since 3×665305³ = 883453339464742875, which contains 333 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 665305.

It is not an unprimeable number, because it can be changed into a prime (665303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (100368).

2⁶⁶⁵³⁰⁵ is an apocalyptic number.

It is an amenable number.

665305 is a deficient number, since it is larger than the sum of its proper divisors (137639).

665305 is a wasteful number, since it uses less digits than its factorization.

665305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 665305 is about 815.6623075759. The cubic root of 665305 is about 87.2985296642.

The spelling of 665305 in words is "six hundred sixty-five thousand, three hundred five".