664443743 has 4 divisors (see below), whose sum is σ = 682401720. Its totient is φ = 646485768.

The previous prime is 664443727. The next prime is 664443749. The reversal of 664443743 is 347344466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664443743 - 2⁴ = 664443727 is a prime.

It is a super-3 number, since 3×664443743³ (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 a self number, because there is not a number n which added to its sum of digits gives 664443743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664443749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8978933 + ... + 8979006.

It is an arithmetic number, because the mean of its divisors is an integer number (170600430).

Almost surely, 2^664443743 is an apocalyptic number.

664443743 is a deficient number, since it is larger than the sum of its proper divisors (17957977).

664443743 is a wasteful number, since it uses less digits than its factorization.

664443743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17957976.

The product of its digits is 580608, while the sum is 41.

The square root of 664443743 is about 25776.8062994623. The cubic root of 664443743 is about 872.6084322125.

The spelling of 664443743 in words is "six hundred sixty-four million, four hundred forty-three thousand, seven hundred forty-three".