665984736 has 72 divisors (see below), whose sum is σ = 1934229024. Its totient is φ = 217267200.

The previous prime is 665984717. The next prime is 665984747. The reversal of 665984736 is 637489566.

665984736 is a `hidden beast` number, since 6 + 6 + 598 + 47 + 3 + 6 = 666.

665984736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11065 + ... + 38136.

It is an arithmetic number, because the mean of its divisors is an integer number (26864292).

Almost surely, 2^665984736 is an apocalyptic number.

It is an amenable number.

665984736 is an abundant number, since it is smaller than the sum of its proper divisors (1268244288).

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

665984736 is a wasteful number, since it uses less digits than its factorization.

665984736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49264 (or 49253 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 665984736 is about 25806.6800654404. The cubic root of 665984736 is about 873.2825024640.

The spelling of 665984736 in words is "six hundred sixty-five million, nine hundred eighty-four thousand, seven hundred thirty-six".