561601660556 has 6 divisors (see below), whose sum is σ = 982802905980. Its totient is φ = 280800830276.

The previous prime is 561601660537. The next prime is 561601660589. The reversal of 561601660556 is 655066106165.

It is a self number, because there is not a number n which added to its sum of digits gives 561601660556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70200207566 + ... + 70200207573.

It is an arithmetic number, because the mean of its divisors is an integer number (163800484330).

Almost surely, 2^561601660556 is an apocalyptic number.

It is an amenable number.

561601660556 is a deficient number, since it is larger than the sum of its proper divisors (421201245424).

561601660556 is a wasteful number, since it uses less digits than its factorization.

561601660556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140400415143 (or 140400415141 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 561601660556 in words is "five hundred sixty-one billion, six hundred one million, six hundred sixty thousand, five hundred fifty-six".