320144421545 has 16 divisors (see below), whose sum is σ = 413738003280. Its totient is φ = 236406968064.

The previous prime is 320144421529. The next prime is 320144421547. The reversal of 320144421545 is 545124441023.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 109166803216 + 210977618329 = 330404^2 + 459323^2 .

It is a cyclic number.

It is not a de Polignac number, because 320144421545 - 2⁴ = 320144421529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320144421547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2909267 + ... + 3017303.

It is an arithmetic number, because the mean of its divisors is an integer number (25858625205).

Almost surely, 2^320144421545 is an apocalyptic number.

It is an amenable number.

320144421545 is a deficient number, since it is larger than the sum of its proper divisors (93593581735).

320144421545 is a wasteful number, since it uses less digits than its factorization.

320144421545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153644.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 320144421545 its reverse (545124441023), we get a palindrome (865268862568).

The spelling of 320144421545 in words is "three hundred twenty billion, one hundred forty-four million, four hundred twenty-one thousand, five hundred forty-five".