666422 has 8 divisors (see below), whose sum is σ = 1018656. Its totient is φ = 326872.

The previous prime is 666403. The next prime is 666427. The reversal of 666422 is 224666.

666422 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666391 and 666400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666427) 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, 3038 + ... + 3249.

It is an arithmetic number, because the mean of its divisors is an integer number (127332).

2⁶⁶⁶⁴²² is an apocalyptic number.

666422 is a deficient number, since it is larger than the sum of its proper divisors (352234).

666422 is a wasteful number, since it uses less digits than its factorization.

666422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6342.

The product of its digits is 3456, while the sum is 26.

The square root of 666422 is about 816.3467400560. The cubic root of 666422 is about 87.3473583650.

The spelling of 666422 in words is "six hundred sixty-six thousand, four hundred twenty-two".