561342166 has 32 divisors (see below), whose sum is σ = 1067592960. Its totient is φ = 214994400.

The previous prime is 561342161. The next prime is 561342181. The reversal of 561342166 is 661243165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561342161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21805 + ... + 39976.

It is an arithmetic number, because the mean of its divisors is an integer number (33362280).

Almost surely, 2^561342166 is an apocalyptic number.

561342166 is a deficient number, since it is larger than the sum of its proper divisors (506250794).

561342166 is a wasteful number, since it uses less digits than its factorization.

561342166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61860.

The product of its digits is 25920, while the sum is 34.

The square root of 561342166 is about 23692.6605935256. The cubic root of 561342166 is about 824.9150404093.

Subtracting 561342166 from its reverse (661243165), we obtain a palindrome (99900999).

The spelling of 561342166 in words is "five hundred sixty-one million, three hundred forty-two thousand, one hundred sixty-six".