665495 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 528544.

The previous prime is 665479. The next prime is 665501. The reversal of 665495 is 594566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 665495 - 2⁴ = 665479 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437 + ... + 1233.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁶⁶⁵⁴⁹⁵ is an apocalyptic number.

665495 is a deficient number, since it is larger than the sum of its proper divisors (138889).

665495 is a wasteful number, since it uses less digits than its factorization.

665495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969.

The product of its digits is 32400, while the sum is 35.

The square root of 665495 is about 815.7787690299. The cubic root of 665495 is about 87.3068392074.

The spelling of 665495 in words is "six hundred sixty-five thousand, four hundred ninety-five".