665935 has 4 divisors (see below), whose sum is σ = 799128. Its totient is φ = 532744.

The previous prime is 665923. The next prime is 665947. The reversal of 665935 is 539566.

665935 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 539566 = 2 ⋅269783.

It is an interprime number because it is at equal distance from previous prime (665923) and next prime (665947).

It is a cyclic number.

It is not a de Polignac number, because 665935 - 2¹³ = 657743 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665935.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66589 + ... + 66598.

It is an arithmetic number, because the mean of its divisors is an integer number (199782).

2⁶⁶⁵⁹³⁵ is an apocalyptic number.

665935 is a deficient number, since it is larger than the sum of its proper divisors (133193).

665935 is a wasteful number, since it uses less digits than its factorization.

665935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133192.

The product of its digits is 24300, while the sum is 34.

The square root of 665935 is about 816.0484054270. The cubic root of 665935 is about 87.3260762897.

It can be divided in two parts, 665 and 935, that added together give a square (1600 = 40²).

The spelling of 665935 in words is "six hundred sixty-five thousand, nine hundred thirty-five".