660213 has 12 divisors (see below), whose sum is σ = 963820. Its totient is φ = 435456.

The previous prime is 660199. The next prime is 660217. The reversal of 660213 is 312066.

It is a happy number.

660213 is a `hidden beast` number, since 660 + 2 + 1 + 3 = 666.

660213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 338724 + 321489 = 582^2 + 567^2 .

It is not a de Polignac number, because 660213 - 2⁴ = 660197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 645 + ... + 1317.

2⁶⁶⁰²¹³ is an apocalyptic number.

It is an amenable number.

660213 is a deficient number, since it is larger than the sum of its proper divisors (303607).

660213 is a wasteful number, since it uses less digits than its factorization.

660213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 660213 is about 812.5349223264. The cubic root of 660213 is about 87.0752420820.

Adding to 660213 its reverse (312066), we get a palindrome (972279).

The spelling of 660213 in words is "six hundred sixty thousand, two hundred thirteen".