665622 has 12 divisors (see below), whose sum is σ = 1442220. Its totient is φ = 221868.

The previous prime is 665617. The next prime is 665629. The reversal of 665622 is 226566.

665622 is a `hidden beast` number, since 6 + 656 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18472 + ... + 18507.

It is an arithmetic number, because the mean of its divisors is an integer number (120185).

2⁶⁶⁵⁶²² is an apocalyptic number.

665622 is an abundant number, since it is smaller than the sum of its proper divisors (776598).

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

665622 is a wasteful number, since it uses less digits than its factorization.

665622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36987 (or 36984 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 665622 is about 815.8566050477. The cubic root of 665622 is about 87.3123925992.

It can be divided in two parts, 66562 and 2, that added together give a square (66564 = 258²).

The spelling of 665622 in words is "six hundred sixty-five thousand, six hundred twenty-two".