320261253602520 has 256 divisors, whose sum is σ = 972030323911680. Its totient is φ = 84408920064000.

The previous prime is 320261253602491. The next prime is 320261253602533. The reversal of 320261253602520 is 25206352162023.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31549719445 + ... + 31549729595.

It is an arithmetic number, because the mean of its divisors is an integer number (3796993452780).

Almost surely, 2^{320261253602520} is an apocalyptic number.

320261253602520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320261253602520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486015161955840).

320261253602520 is an abundant number, since it is smaller than the sum of its proper divisors (651769070309160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320261253602520 is a wasteful number, since it uses less digits than its factorization.

320261253602520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18506 (or 18502 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 320261253602520 in words is "three hundred twenty trillion, two hundred sixty-one billion, two hundred fifty-three million, six hundred two thousand, five hundred twenty".