320261440565 has 24 divisors (see below), whose sum is σ = 428377227264. Its totient is φ = 229636853600.

The previous prime is 320261440553. The next prime is 320261440601. The reversal of 320261440565 is 565044162023.

It is not a de Polignac number, because 320261440565 - 2⁶ = 320261440501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3684917 + ... + 3770826.

It is an arithmetic number, because the mean of its divisors is an integer number (17849051136).

Almost surely, 2^320261440565 is an apocalyptic number.

It is an amenable number.

320261440565 is a deficient number, since it is larger than the sum of its proper divisors (108115786699).

320261440565 is a wasteful number, since it uses less digits than its factorization.

320261440565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7455841 (or 7455830 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 320261440565 in words is "three hundred twenty billion, two hundred sixty-one million, four hundred forty thousand, five hundred sixty-five".