665982 has 20 divisors (see below), whose sum is σ = 1492656. Its totient is φ = 221940.

The previous prime is 665981. The next prime is 665983. The reversal of 665982 is 289566.

665982 is a `hidden beast` number, since 66 + 598 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (665981) and next prime (665983).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665981) 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 9 ways as a sum of consecutive naturals, for example, 1894 + ... + 2217.

2⁶⁶⁵⁹⁸² is an apocalyptic number.

665982 is an abundant number, since it is smaller than the sum of its proper divisors (826674).

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

665982 is a wasteful number, since it uses less digits than its factorization.

665982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125 (or 4116 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 665982 is about 816.0772022303. The cubic root of 665982 is about 87.3281306589.

The spelling of 665982 in words is "six hundred sixty-five thousand, nine hundred eighty-two".