321976664560 has 80 divisors (see below), whose sum is σ = 788641264800. Its totient is φ = 121912224768.

The previous prime is 321976664551. The next prime is 321976664561. The reversal of 321976664560 is 65466679123.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321976664561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1781902 + ... + 1954258.

It is an arithmetic number, because the mean of its divisors is an integer number (9858015810).

Almost surely, 2^321976664560 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 321976664560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394320632400).

321976664560 is an abundant number, since it is smaller than the sum of its proper divisors (466664600240).

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

321976664560 is a wasteful number, since it uses less digits than its factorization.

321976664560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173618 (or 173612 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 321976664560 in words is "three hundred twenty-one billion, nine hundred seventy-six million, six hundred sixty-four thousand, five hundred sixty".