561843394320 has 160 divisors (see below), whose sum is σ = 1883745182592. Its totient is φ = 137706172416.

The previous prime is 561843394289. The next prime is 561843394367. The reversal of 561843394320 is 23493348165.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 561843394320.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340527 + ... + 1113393.

Almost surely, 2^561843394320 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 561843394320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941872591296).

561843394320 is an abundant number, since it is smaller than the sum of its proper divisors (1321901788272).

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

561843394320 is a wasteful number, since it uses less digits than its factorization.

561843394320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773129 (or 773123 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 561843394320 in words is "five hundred sixty-one billion, eight hundred forty-three million, three hundred ninety-four thousand, three hundred twenty".