320011245520 has 80 divisors (see below), whose sum is σ = 750286800000. Its totient is φ = 126930312704.

The previous prime is 320011245517. The next prime is 320011245539. The reversal of 320011245520 is 25542110023.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7117671 + ... + 7162489.

It is an arithmetic number, because the mean of its divisors is an integer number (9378585000).

Almost surely, 2^320011245520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320011245520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375143400000).

320011245520 is an abundant number, since it is smaller than the sum of its proper divisors (430275554480).

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

320011245520 is a wasteful number, since it uses less digits than its factorization.

320011245520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45580 (or 45574 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 320011245520 its reverse (25542110023), we get a palindrome (345553355543).

The spelling of 320011245520 in words is "three hundred twenty billion, eleven million, two hundred forty-five thousand, five hundred twenty".