561242166 has 32 divisors (see below), whose sum is σ = 1161547776. Its totient is φ = 180600000.

The previous prime is 561242147. The next prime is 561242173. The reversal of 561242166 is 661242165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76666 + ... + 83666.

It is an arithmetic number, because the mean of its divisors is an integer number (36298368).

Almost surely, 2^561242166 is an apocalyptic number.

561242166 is an abundant number, since it is smaller than the sum of its proper divisors (600305610).

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

561242166 is a wasteful number, since it uses less digits than its factorization.

561242166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468.

The product of its digits is 17280, while the sum is 33.

The square root of 561242166 is about 23690.5501413538. The cubic root of 561242166 is about 824.8660528173.

Subtracting 561242166 from its reverse (661242165), we obtain a palindrome (99999999).

The spelling of 561242166 in words is "five hundred sixty-one million, two hundred forty-two thousand, one hundred sixty-six".