320122511165521 has 16 divisors (see below), whose sum is σ = 341193739829760. Its totient is φ = 299306681739520.

The previous prime is 320122511165491. The next prime is 320122511165537. The reversal of 320122511165521 is 125561115221023.

It is a cyclic number.

It is not a de Polignac number, because 320122511165521 - 2¹³ = 320122511157329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320122511165021) 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, 99281665 + ... + 102455326.

It is an arithmetic number, because the mean of its divisors is an integer number (21324608739360).

Almost surely, 2^{320122511165521} is an apocalyptic number.

It is an amenable number.

320122511165521 is a deficient number, since it is larger than the sum of its proper divisors (21071228664239).

320122511165521 is a wasteful number, since it uses less digits than its factorization.

320122511165521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201737624.

The product of its (nonzero) digits is 36000, while the sum is 37.

Adding to 320122511165521 its reverse (125561115221023), we get a palindrome (445683626386544).

The spelling of 320122511165521 in words is "three hundred twenty trillion, one hundred twenty-two billion, five hundred eleven million, one hundred sixty-five thousand, five hundred twenty-one".