665440753 has 8 divisors (see below), whose sum is σ = 670035456. Its totient is φ = 660858000.

The previous prime is 665440733. The next prime is 665440799. The reversal of 665440753 is 357044566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665440753 - 2¹³ = 665432561 is a prime.

It is a super-3 number, since 3×665440753³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665440733) 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 7 ways as a sum of consecutive naturals, for example, 127903 + ... + 133003.

It is an arithmetic number, because the mean of its divisors is an integer number (83754432).

Almost surely, 2^665440753 is an apocalyptic number.

It is an amenable number.

665440753 is a deficient number, since it is larger than the sum of its proper divisors (4594703).

665440753 is a wasteful number, since it uses less digits than its factorization.

665440753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5975.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 665440753 is about 25796.1383350299. The cubic root of 665440753 is about 873.0446690670.

The spelling of 665440753 in words is "six hundred sixty-five million, four hundred forty thousand, seven hundred fifty-three".