561666055576 has 32 divisors (see below), whose sum is σ = 1077884533440. Its totient is φ = 274256333568.

The previous prime is 561666055543. The next prime is 561666055663. The reversal of 561666055576 is 675550666165.

It is a self number, because there is not a number n which added to its sum of digits gives 561666055576.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462515 + ... + 1806178.

It is an arithmetic number, because the mean of its divisors is an integer number (33683891670).

Almost surely, 2^561666055576 is an apocalyptic number.

It is an amenable number.

561666055576 is a deficient number, since it is larger than the sum of its proper divisors (516218477864).

561666055576 is a wasteful number, since it uses less digits than its factorization.

561666055576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269203 (or 3269199 counting only the distinct ones).

The product of its (nonzero) digits is 34020000, while the sum is 58.

The spelling of 561666055576 in words is "five hundred sixty-one billion, six hundred sixty-six million, fifty-five thousand, five hundred seventy-six".