665822 has 8 divisors (see below), whose sum is σ = 1057536. Its totient is φ = 313312.

The previous prime is 665813. The next prime is 665843. The reversal of 665822 is 228566.

665822 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 congruent number.

It is an unprimeable number.

665822 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9758 + ... + 9825.

It is an arithmetic number, because the mean of its divisors is an integer number (132192).

2⁶⁶⁵⁸²² is an apocalyptic number.

665822 is a deficient number, since it is larger than the sum of its proper divisors (391714).

665822 is a wasteful number, since it uses less digits than its factorization.

665822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19602.

The product of its digits is 5760, while the sum is 29.

The square root of 665822 is about 815.9791664007. The cubic root of 665822 is about 87.3211366660.

The spelling of 665822 in words is "six hundred sixty-five thousand, eight hundred twenty-two".