320991026513 has 32 divisors (see below), whose sum is σ = 350803353600. Its totient is φ = 292478598144.

The previous prime is 320991026509. The next prime is 320991026519. The reversal of 320991026513 is 315620199023.

It is a cyclic number.

It is not a de Polignac number, because 320991026513 - 2² = 320991026509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320991026519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143362448 + ... + 143364686.

It is an arithmetic number, because the mean of its divisors is an integer number (10962604800).

Almost surely, 2^320991026513 is an apocalyptic number.

It is an amenable number.

320991026513 is a deficient number, since it is larger than the sum of its proper divisors (29812327087).

320991026513 is a wasteful number, since it uses less digits than its factorization.

320991026513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329.

The product of its (nonzero) digits is 87480, while the sum is 41.

The spelling of 320991026513 in words is "three hundred twenty billion, nine hundred ninety-one million, twenty-six thousand, five hundred thirteen".