665594 has 8 divisors (see below), whose sum is σ = 1022868. Its totient is φ = 324640.

The previous prime is 665591. The next prime is 665603. The reversal of 665594 is 495566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 664225 + 1369 = 815^2 + 37^2 .

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

It is not an unprimeable number, because it can be changed into a prime (665591) 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, 3977 + ... + 4140.

2⁶⁶⁵⁵⁹⁴ is an apocalyptic number.

665594 is a deficient number, since it is larger than the sum of its proper divisors (357274).

665594 is a wasteful number, since it uses less digits than its factorization.

665594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8160.

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

The square root of 665594 is about 815.8394449890. The cubic root of 665594 is about 87.3111682900.

The spelling of 665594 in words is "six hundred sixty-five thousand, five hundred ninety-four".