320556434226644 has 192 divisors, whose sum is σ = 720622121716224. Its totient is φ = 121138744320000.

The previous prime is 320556434226641. The next prime is 320556434226689. The reversal of 320556434226644 is 446622434655023.

It is a self number, because there is not a number n which added to its sum of digits gives 320556434226644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320556434226641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1944793754 + ... + 1944958574.

It is an arithmetic number, because the mean of its divisors is an integer number (3753240217272).

Almost surely, 2^{320556434226644} 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 320556434226644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360311060858112).

320556434226644 is an abundant number, since it is smaller than the sum of its proper divisors (400065687489580).

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

320556434226644 is a wasteful number, since it uses less digits than its factorization.

320556434226644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165778 (or 165776 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 56.

The spelling of 320556434226644 in words is "three hundred twenty trillion, five hundred fifty-six billion, four hundred thirty-four million, two hundred twenty-six thousand, six hundred forty-four".