665384112 has 160 divisors (see below), whose sum is σ = 2009871360. Its totient is φ = 210355200.

The previous prime is 665384099. The next prime is 665384113. The reversal of 665384112 is 211483566.

It is a happy number.

665384112 is a `hidden beast` number, since 6 + 6 + 538 + 4 + 112 = 666.

665384112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (665384113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1659112 + ... + 1659512.

It is an arithmetic number, because the mean of its divisors is an integer number (12561696).

Almost surely, 2^665384112 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 665384112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004935680).

665384112 is an abundant number, since it is smaller than the sum of its proper divisors (1344487248).

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

665384112 is a wasteful number, since it uses less digits than its factorization.

665384112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608 (or 596 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 665384112 is about 25795.0404535446. The cubic root of 665384112 is about 873.0198977527.

The spelling of 665384112 in words is "six hundred sixty-five million, three hundred eighty-four thousand, one hundred twelve".