320544443452156 has 144 divisors (see below), whose sum is σ = 730997473651200. Its totient is φ = 120245088458880.

The previous prime is 320544443452133. The next prime is 320544443452157. The reversal of 320544443452156 is 651254344445023.

It is a super-2 number, since 2×320544443452156² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320544443452157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30728635 + ... + 39816301.

It is an arithmetic number, because the mean of its divisors is an integer number (5076371344800).

Almost surely, 2^{320544443452156} 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 320544443452156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365498736825600).

320544443452156 is an abundant number, since it is smaller than the sum of its proper divisors (410453030199044).

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

320544443452156 is a wasteful number, since it uses less digits than its factorization.

320544443452156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9088088 (or 9088075 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 52.

Adding to 320544443452156 its reverse (651254344445023), we get a palindrome (971798787897179).

The spelling of 320544443452156 in words is "three hundred twenty trillion, five hundred forty-four billion, four hundred forty-three million, four hundred fifty-two thousand, one hundred fifty-six".