665049984 has 64 divisors (see below), whose sum is σ = 1782858000. Its totient is φ = 219635712.

The previous prime is 665049961. The next prime is 665050003. The reversal of 665049984 is 489940566.

665049984 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 (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33912 + ... + 49800.

Almost surely, 2^665049984 is an apocalyptic number.

665049984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665049984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891429000).

665049984 is an abundant number, since it is smaller than the sum of its proper divisors (1117808016).

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

665049984 is a wasteful number, since it uses less digits than its factorization.

665049984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16015 (or 16003 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 665049984 is about 25788.5630464359. The cubic root of 665049984 is about 872.8737419572.

The spelling of 665049984 in words is "six hundred sixty-five million, forty-nine thousand, nine hundred eighty-four".