665659896 has 64 divisors (see below), whose sum is σ = 1864529280. Its totient is φ = 196260480.

The previous prime is 665659849. The next prime is 665659901. The reversal of 665659896 is 698956566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24306 + ... + 43841.

It is an arithmetic number, because the mean of its divisors is an integer number (29133270).

Almost surely, 2^665659896 is an apocalyptic number.

665659896 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

665659896 is an abundant number, since it is smaller than the sum of its proper divisors (1198869384).

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

665659896 is a wasteful number, since it uses less digits than its factorization.

665659896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68204 (or 68200 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 60.

The square root of 665659896 is about 25800.3855785141. The cubic root of 665659896 is about 873.1404955945.

The spelling of 665659896 in words is "six hundred sixty-five million, six hundred fifty-nine thousand, eight hundred ninety-six".