561361211864728 has 16 divisors (see below), whose sum is σ = 1148238842450760. Its totient is φ = 255164187211200.

The previous prime is 561361211864599. The next prime is 561361211864737. The reversal of 561361211864728 is 827468112163165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3189552340053 + ... + 3189552340228.

Almost surely, 2^{561361211864728} is an apocalyptic number.

It is an amenable number.

561361211864728 is an abundant number, since it is smaller than the sum of its proper divisors (586877630586032).

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

561361211864728 is a wasteful number, since it uses less digits than its factorization.

561361211864728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379104680298 (or 6379104680294 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 61.

The spelling of 561361211864728 in words is "five hundred sixty-one trillion, three hundred sixty-one billion, two hundred eleven million, eight hundred sixty-four thousand, seven hundred twenty-eight".