664453441 has 4 divisors (see below), whose sum is σ = 671919300. Its totient is φ = 656987584.

The previous prime is 664453397. The next prime is 664453451. The reversal of 664453441 is 144354466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 216707841 + 447745600 = 14721^2 + 21160^2 .

It is a cyclic number.

It is not a de Polignac number, because 664453441 - 2¹⁷ = 664322369 is a prime.

It is a super-3 number, since 3×664453441³ (a number of 27 digits) contains 333 as substring.

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 664453441.

It is not an unprimeable number, because it can be changed into a prime (664453451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3732796 + ... + 3732973.

It is an arithmetic number, because the mean of its divisors is an integer number (167979825).

Almost surely, 2^664453441 is an apocalyptic number.

It is an amenable number.

664453441 is a deficient number, since it is larger than the sum of its proper divisors (7465859).

664453441 is an equidigital number, since it uses as much as digits as its factorization.

664453441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7465858.

The product of its digits is 138240, while the sum is 37.

The square root of 664453441 is about 25776.9944136239. The cubic root of 664453441 is about 872.6126776260.

The spelling of 664453441 in words is "six hundred sixty-four million, four hundred fifty-three thousand, four hundred forty-one".