320445535561 has 8 divisors (see below), whose sum is σ = 325710204800. Its totient is φ = 315181236240.

The previous prime is 320445535541. The next prime is 320445535573. The reversal of 320445535561 is 165535544023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320445535561 - 2¹⁹ = 320445011273 is a prime.

It is a super-2 number, since 2×320445535561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320445535541) 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 7 ways as a sum of consecutive naturals, for example, 2063680 + ... + 2213518.

It is an arithmetic number, because the mean of its divisors is an integer number (40713775600).

Almost surely, 2^320445535561 is an apocalyptic number.

It is an amenable number.

320445535561 is a deficient number, since it is larger than the sum of its proper divisors (5264669239).

320445535561 is a wasteful number, since it uses less digits than its factorization.

320445535561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184959.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 320445535561 in words is "three hundred twenty billion, four hundred forty-five million, five hundred thirty-five thousand, five hundred sixty-one".