665475 has 24 divisors (see below), whose sum is σ = 1160640. Its totient is φ = 335520.

The previous prime is 665447. The next prime is 665479. The reversal of 665475 is 574566.

It is not a de Polignac number, because 665475 - 2¹⁶ = 599939 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1192 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (48360).

2⁶⁶⁵⁴⁷⁵ is an apocalyptic number.

665475 is a deficient number, since it is larger than the sum of its proper divisors (495165).

665475 is a wasteful number, since it uses less digits than its factorization.

665475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 494 counting only the distinct ones).

The product of its digits is 25200, while the sum is 33.

The square root of 665475 is about 815.7665107125. The cubic root of 665475 is about 87.3059645931.

Subtracting from 665475 its reverse (574566), we obtain a palindrome (90909).

The spelling of 665475 in words is "six hundred sixty-five thousand, four hundred seventy-five".