666533 has 4 divisors (see below), whose sum is σ = 761760. Its totient is φ = 571308.

The previous prime is 666529. The next prime is 666541. The reversal of 666533 is 335666.

666533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 666533 - 2² = 666529 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666496 and 666505.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666533.

It is not an unprimeable number, because it can be changed into a prime (666233) 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, 47603 + ... + 47616.

It is an arithmetic number, because the mean of its divisors is an integer number (190440).

2⁶⁶⁶⁵³³ is an apocalyptic number.

It is an amenable number.

666533 is a deficient number, since it is larger than the sum of its proper divisors (95227).

666533 is an equidigital number, since it uses as much as digits as its factorization.

666533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95226.

The product of its digits is 9720, while the sum is 29.

The square root of 666533 is about 816.4147230422. The cubic root of 666533 is about 87.3522076539.

The spelling of 666533 in words is "six hundred sixty-six thousand, five hundred thirty-three".