320161556560 has 160 divisors (see below), whose sum is σ = 792143763840. Its totient is φ = 119997997056.

The previous prime is 320161556551. The next prime is 320161556569. The reversal of 320161556560 is 65655161023.

It is an interprime number because it is at equal distance from previous prime (320161556551) and next prime (320161556569).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320161556569) 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, 139381332 + ... + 139383628.

It is an arithmetic number, because the mean of its divisors is an integer number (4950898524).

Almost surely, 2^320161556560 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 320161556560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (396071881920).

320161556560 is an abundant number, since it is smaller than the sum of its proper divisors (471982207280).

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

320161556560 is a wasteful number, since it uses less digits than its factorization.

320161556560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 320161556560 in words is "three hundred twenty billion, one hundred sixty-one million, five hundred fifty-six thousand, five hundred sixty".