561617532873566 has 32 divisors (see below), whose sum is σ = 926781633616608. Its totient is φ = 253664571968640.

The previous prime is 561617532873547. The next prime is 561617532873587. The reversal of 561617532873566 is 665378235716165.

It is a self number, because there is not a number n which added to its sum of digits gives 561617532873566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898442420 + ... + 899067303.

It is an arithmetic number, because the mean of its divisors is an integer number (28961926050519).

Almost surely, 2^{561617532873566} is an apocalyptic number.

561617532873566 is a deficient number, since it is larger than the sum of its proper divisors (365164100743042).

561617532873566 is a wasteful number, since it uses less digits than its factorization.

561617532873566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797509996.

The product of its digits is 1143072000, while the sum is 71.

The spelling of 561617532873566 in words is "five hundred sixty-one trillion, six hundred seventeen billion, five hundred thirty-two million, eight hundred seventy-three thousand, five hundred sixty-six".