665473 has 4 divisors (see below), whose sum is σ = 679680. Its totient is φ = 651268.

The previous prime is 665447. The next prime is 665479. The reversal of 665473 is 374566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665473 - 2¹³ = 657281 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 7033 + ... + 7126.

It is an arithmetic number, because the mean of its divisors is an integer number (169920).

2⁶⁶⁵⁴⁷³ is an apocalyptic number.

It is an amenable number.

665473 is a deficient number, since it is larger than the sum of its proper divisors (14207).

665473 is a wasteful number, since it uses less digits than its factorization.

665473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14206.

The product of its digits is 15120, while the sum is 31.

The square root of 665473 is about 815.7652848706. The cubic root of 665473 is about 87.3058771308.

The spelling of 665473 in words is "six hundred sixty-five thousand, four hundred seventy-three".