561954816 has 180 divisors, whose sum is σ = 1683437392. Its totient is φ = 180486144.

The previous prime is 561954797. The next prime is 561954821. The reversal of 561954816 is 618459165.

561954816 is a `hidden beast` number, since 561 + 9 + 5 + 4 + 81 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5455821 + ... + 5455923.

Almost surely, 2^561954816 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 561954816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841718696).

561954816 is an abundant number, since it is smaller than the sum of its proper divisors (1121482576).

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

561954816 is a wasteful number, since it uses less digits than its factorization.

561954816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 145 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 561954816 is about 23705.5861771018. The cubic root of 561954816 is about 825.2150359571.

The spelling of 561954816 in words is "five hundred sixty-one million, nine hundred fifty-four thousand, eight hundred sixteen".