665422 has 4 divisors (see below), whose sum is σ = 998136. Its totient is φ = 332710.

The previous prime is 665419. The next prime is 665429. The reversal of 665422 is 224566.

665422 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.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166354 + ... + 166357.

It is an arithmetic number, because the mean of its divisors is an integer number (249534).

2⁶⁶⁵⁴²² is an apocalyptic number.

665422 is a deficient number, since it is larger than the sum of its proper divisors (332714).

665422 is a wasteful number, since it uses less digits than its factorization.

665422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332713.

The product of its digits is 2880, while the sum is 25.

The square root of 665422 is about 815.7340252803. The cubic root of 665422 is about 87.3036467806.

Adding to 665422 its reverse (224566), we get a palindrome (889988).

The spelling of 665422 in words is "six hundred sixty-five thousand, four hundred twenty-two".