320261253602521 has 16 divisors (see below), whose sum is σ = 400840402734720. Its totient is φ = 248583195463680.

The previous prime is 320261253602491. The next prime is 320261253602533. The reversal of 320261253602521 is 125206352162023.

It is not a de Polignac number, because 320261253602521 - 2²¹ = 320261251505369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320261253102521) 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, 8091881106 + ... + 8091920683.

It is an arithmetic number, because the mean of its divisors is an integer number (25052525170920).

Almost surely, 2^{320261253602521} is an apocalyptic number.

It is an amenable number.

320261253602521 is a deficient number, since it is larger than the sum of its proper divisors (80579149132199).

320261253602521 is a wasteful number, since it uses less digits than its factorization.

320261253602521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16183802064.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 320261253602521 in words is "three hundred twenty trillion, two hundred sixty-one billion, two hundred fifty-three million, six hundred two thousand, five hundred twenty-one".