660222 has 24 divisors (see below), whose sum is σ = 1465464. Its totient is φ = 214704.

The previous prime is 660217. The next prime is 660227. The reversal of 660222 is 222066.

660222 is a `hidden beast` number, since 660 + 2 + 2 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (660217) and next prime (660227).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 660195 and 660204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (61061).

2⁶⁶⁰²²² is an apocalyptic number.

660222 is an abundant number, since it is smaller than the sum of its proper divisors (805242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660222 is a wasteful number, since it uses less digits than its factorization.

660222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 660222 is about 812.5404605310. The cubic root of 660222 is about 87.0756377491.

Adding to 660222 its reverse (222066), we get a palindrome (882288).

The spelling of 660222 in words is "six hundred sixty thousand, two hundred twenty-two".