320987333365 has 16 divisors (see below), whose sum is σ = 409955925168. Its totient is φ = 240432316416.

The previous prime is 320987333333. The next prime is 320987333369. The reversal of 320987333365 is 563333789023.

It can be written as a sum of positive squares in 8 ways, for example, as 1094154084 + 319893179281 = 33078^2 + 565591^2 .

It is a cyclic number.

It is not a de Polignac number, because 320987333365 - 2⁵ = 320987333333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320987333369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9766812 + ... + 9799621.

It is an arithmetic number, because the mean of its divisors is an integer number (25622245323).

Almost surely, 2^320987333365 is an apocalyptic number.

It is an amenable number.

320987333365 is a deficient number, since it is larger than the sum of its proper divisors (88968591803).

320987333365 is a wasteful number, since it uses less digits than its factorization.

320987333365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19566648.

The product of its (nonzero) digits is 7348320, while the sum is 52.

The spelling of 320987333365 in words is "three hundred twenty billion, nine hundred eighty-seven million, three hundred thirty-three thousand, three hundred sixty-five".