664043545 has 16 divisors (see below), whose sum is σ = 920429568. Its totient is φ = 454531840.

The previous prime is 664043543. The next prime is 664043563. The reversal of 664043545 is 545340466.

It is not a de Polignac number, because 664043545 - 2¹ = 664043543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664043543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354169 + ... + 356038.

It is an arithmetic number, because the mean of its divisors is an integer number (57526848).

Almost surely, 2^664043545 is an apocalyptic number.

It is an amenable number.

664043545 is a deficient number, since it is larger than the sum of its proper divisors (256386023).

664043545 is a wasteful number, since it uses less digits than its factorization.

664043545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710240.

The product of its (nonzero) digits is 172800, while the sum is 37.

The square root of 664043545 is about 25769.0423764641. The cubic root of 664043545 is about 872.4332047945.

The spelling of 664043545 in words is "six hundred sixty-four million, forty-three thousand, five hundred forty-five".