320231155511521 has 16 divisors (see below), whose sum is σ = 324812093195520. Its totient is φ = 315652188866560.

The previous prime is 320231155511507. The next prime is 320231155511557. The reversal of 320231155511521 is 125115551132023.

It is a cyclic number.

It is not a de Polignac number, because 320231155511521 - 2³⁹ = 319681399697633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320231155511581) 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, 7551353700 + ... + 7551396106.

It is an arithmetic number, because the mean of its divisors is an integer number (20300755824720).

Almost surely, 2^{320231155511521} is an apocalyptic number.

It is an amenable number.

320231155511521 is a deficient number, since it is larger than the sum of its proper divisors (4580937683999).

320231155511521 is a wasteful number, since it uses less digits than its factorization.

320231155511521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63104.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 320231155511521 in words is "three hundred twenty trillion, two hundred thirty-one billion, one hundred fifty-five million, five hundred eleven thousand, five hundred twenty-one".