561511105166 has 24 divisors (see below), whose sum is σ = 934449589080. Its totient is φ = 252846960080.

The previous prime is 561511105163. The next prime is 561511105171. The reversal of 561511105166 is 661501115165.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561511105163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10816601 + ... + 10868388.

It is an arithmetic number, because the mean of its divisors is an integer number (38935399545).

Almost surely, 2^561511105166 is an apocalyptic number.

561511105166 is a deficient number, since it is larger than the sum of its proper divisors (372938483914).

561511105166 is a wasteful number, since it uses less digits than its factorization.

561511105166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21685120 (or 21685109 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 38.

Subtracting 561511105166 from its reverse (661501115165), we obtain a palindrome (99990009999).

The spelling of 561511105166 in words is "five hundred sixty-one billion, five hundred eleven million, one hundred five thousand, one hundred sixty-six".