561666722228 has 24 divisors (see below), whose sum is σ = 1005997792800. Its totient is φ = 274241671200.

The previous prime is 561666722213. The next prime is 561666722263. The reversal of 561666722228 is 822227666165.

It is a self number, because there is not a number n which added to its sum of digits gives 561666722228.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 423503 + ... + 1141353.

It is an arithmetic number, because the mean of its divisors is an integer number (41916574700).

Almost surely, 2^561666722228 is an apocalyptic number.

It is an amenable number.

561666722228 is a deficient number, since it is larger than the sum of its proper divisors (444331070572).

561666722228 is a wasteful number, since it uses less digits than its factorization.

561666722228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722447 (or 722445 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

The spelling of 561666722228 in words is "five hundred sixty-one billion, six hundred sixty-six million, seven hundred twenty-two thousand, two hundred twenty-eight".