561101166 has 12 divisors (see below), whose sum is σ = 1215719232. Its totient is φ = 187033716.

The previous prime is 561101131. The next prime is 561101207. The reversal of 561101166 is 661101165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15586126 + ... + 15586161.

It is an arithmetic number, because the mean of its divisors is an integer number (101309936).

Almost surely, 2^561101166 is an apocalyptic number.

561101166 is an abundant number, since it is smaller than the sum of its proper divisors (654618066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561101166 is a wasteful number, since it uses less digits than its factorization.

561101166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31172295 (or 31172292 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 561101166 is about 23687.5740843169. The cubic root of 561101166 is about 824.7969704249.

Subtracting 561101166 from its reverse (661101165), we obtain a palindrome (99999999).

The spelling of 561101166 in words is "five hundred sixty-one million, one hundred one thousand, one hundred sixty-six".