320991641880 has 256 divisors, whose sum is σ = 1192303687680. Its totient is φ = 67319783424.

The previous prime is 320991641849. The next prime is 320991641921. The reversal of 320991641880 is 88146199023.

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, 1735632 + ... + 1911648.

It is an arithmetic number, because the mean of its divisors is an integer number (4657436280).

Almost surely, 2^320991641880 is an apocalyptic number.

320991641880 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 320991641880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596151843840).

320991641880 is an abundant number, since it is smaller than the sum of its proper divisors (871312045800).

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

320991641880 is a wasteful number, since it uses less digits than its factorization.

320991641880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176218 (or 176214 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 320991641880 in words is "three hundred twenty billion, nine hundred ninety-one million, six hundred forty-one thousand, eight hundred eighty".