665023340 has 48 divisors (see below), whose sum is σ = 1480876992. Its totient is φ = 249993216.

The previous prime is 665023319. The next prime is 665023349. The reversal of 665023340 is 43320566.

It is not an unprimeable number, because it can be changed into a prime (665023349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372089 + ... + 373871.

It is an arithmetic number, because the mean of its divisors is an integer number (30851604).

Almost surely, 2^665023340 is an apocalyptic number.

It is an amenable number.

665023340 is an abundant number, since it is smaller than the sum of its proper divisors (815853652).

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

665023340 is a wasteful number, since it uses less digits than its factorization.

665023340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 665023340 is about 25788.0464556740. The cubic root of 665023340 is about 872.8620851098.

The spelling of 665023340 in words is "six hundred sixty-five million, twenty-three thousand, three hundred forty".