665533 has 8 divisors (see below), whose sum is σ = 768960. Its totient is φ = 569280.

The previous prime is 665527. The next prime is 665549. The reversal of 665533 is 335566.

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 665533 - 2⁵ = 665501 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1593 + ... + 1966.

It is an arithmetic number, because the mean of its divisors is an integer number (96120).

2⁶⁶⁵⁵³³ is an apocalyptic number.

It is an amenable number.

665533 is a deficient number, since it is larger than the sum of its proper divisors (103427).

665533 is a wasteful number, since it uses less digits than its factorization.

665533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587.

The product of its digits is 8100, while the sum is 28.

The square root of 665533 is about 815.8020593257. The cubic root of 665533 is about 87.3085009263.

The spelling of 665533 in words is "six hundred sixty-five thousand, five hundred thirty-three".