665988096 has 88 divisors (see below), whose sum is σ = 1782756864. Its totient is φ = 221040640.

The previous prime is 665988077. The next prime is 665988137. The reversal of 665988096 is 690889566.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1323781 + ... + 1324283.

Almost surely, 2^665988096 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665988096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891378432).

665988096 is an abundant number, since it is smaller than the sum of its proper divisors (1116768768).

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

665988096 is a wasteful number, since it uses less digits than its factorization.

665988096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 57.

The square root of 665988096 is about 25806.7451647820. The cubic root of 665988096 is about 873.2839710784.

The spelling of 665988096 in words is "six hundred sixty-five million, nine hundred eighty-eight thousand, ninety-six".