320565631531321 has 64 divisors (see below), whose sum is σ = 375949408665600. Its totient is φ = 270551117606400.

The previous prime is 320565631531303. The next prime is 320565631531333. The reversal of 320565631531321 is 123135136565023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320565631531321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320565631535321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2835828720 + ... + 2835941758.

It is an arithmetic number, because the mean of its divisors is an integer number (5874209510400).

Almost surely, 2^{320565631531321} is an apocalyptic number.

320565631531321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

320565631531321 is a deficient number, since it is larger than the sum of its proper divisors (55383777134279).

320565631531321 is a wasteful number, since it uses less digits than its factorization.

320565631531321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116270.

The product of its (nonzero) digits is 1458000, while the sum is 46.

The spelling of 320565631531321 in words is "three hundred twenty trillion, five hundred sixty-five billion, six hundred thirty-one million, five hundred thirty-one thousand, three hundred twenty-one".