664231445 has 4 divisors (see below), whose sum is σ = 797077740. Its totient is φ = 531385152.

The previous prime is 664231441. The next prime is 664231471. The reversal of 664231445 is 544132466.

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 286861969 + 377369476 = 16937^2 + 19426^2 .

It is a cyclic number.

It is not a de Polignac number, because 664231445 - 2² = 664231441 is a prime.

It is a super-3 number, since 3×664231445³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664231441) 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 3 ways as a sum of consecutive naturals, for example, 66423140 + ... + 66423149.

It is an arithmetic number, because the mean of its divisors is an integer number (199269435).

Almost surely, 2^664231445 is an apocalyptic number.

It is an amenable number.

664231445 is a deficient number, since it is larger than the sum of its proper divisors (132846295).

664231445 is a wasteful number, since it uses less digits than its factorization.

664231445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132846294.

The product of its digits is 69120, while the sum is 35.

The square root of 664231445 is about 25772.6879661397. The cubic root of 664231445 is about 872.5154859144.

The spelling of 664231445 in words is "six hundred sixty-four million, two hundred thirty-one thousand, four hundred forty-five".