665298744 has 128 divisors (see below), whose sum is σ = 1906502400. Its totient is φ = 191600640.

The previous prime is 665298743. The next prime is 665298749. The reversal of 665298744 is 447892566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665298743) 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 31 ways as a sum of consecutive naturals, for example, 512304 + ... + 513600.

It is an arithmetic number, because the mean of its divisors is an integer number (14894550).

Almost surely, 2^665298744 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 665298744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953251200).

665298744 is an abundant number, since it is smaller than the sum of its proper divisors (1241203656).

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

665298744 is a wasteful number, since it uses less digits than its factorization.

665298744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413 (or 1409 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The square root of 665298744 is about 25793.3856637705. The cubic root of 665298744 is about 872.9825603467.

The spelling of 665298744 in words is "six hundred sixty-five million, two hundred ninety-eight thousand, seven hundred forty-four".