665334642 has 48 divisors (see below), whose sum is σ = 1556597952. Its totient is φ = 189030240.

The previous prime is 665334641. The next prime is 665334671. The reversal of 665334642 is 246433566.

665334642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 665334642.

It is not an unprimeable number, because it can be changed into a prime (665334641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46963 + ... + 59465.

It is an arithmetic number, because the mean of its divisors is an integer number (32429124).

Almost surely, 2^665334642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665334642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778298976).

665334642 is an abundant number, since it is smaller than the sum of its proper divisors (891263310).

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

665334642 is a wasteful number, since it uses less digits than its factorization.

665334642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12703 (or 12696 counting only the distinct ones).

The product of its digits is 311040, while the sum is 39.

The square root of 665334642 is about 25794.0815304597. The cubic root of 665334642 is about 872.9982614457.

The spelling of 665334642 in words is "six hundred sixty-five million, three hundred thirty-four thousand, six hundred forty-two".