665908238 has 8 divisors (see below), whose sum is σ = 1051434120. Its totient is φ = 315430200.

The previous prime is 665908223. The next prime is 665908249. The reversal of 665908238 is 832809566.

It is a happy number.

665908238 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 junction number, because it is equal to n+sod(n) for n = 665908192 and 665908201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8761913 + ... + 8761988.

It is an arithmetic number, because the mean of its divisors is an integer number (131429265).

Almost surely, 2^665908238 is an apocalyptic number.

665908238 is a deficient number, since it is larger than the sum of its proper divisors (385525882).

665908238 is a wasteful number, since it uses less digits than its factorization.

665908238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17523922.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 665908238 is about 25805.1978872474. The cubic root of 665908238 is about 873.2490647994.

The spelling of 665908238 in words is "six hundred sixty-five million, nine hundred eight thousand, two hundred thirty-eight".