561665222 has 4 divisors (see below), whose sum is σ = 842497836. Its totient is φ = 280832610.

The previous prime is 561665189. The next prime is 561665231. The reversal of 561665222 is 222566165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222566165 = 5 ⋅44513233.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140416304 + ... + 140416307.

It is an arithmetic number, because the mean of its divisors is an integer number (210624459).

Almost surely, 2^561665222 is an apocalyptic number.

561665222 is a deficient number, since it is larger than the sum of its proper divisors (280832614).

561665222 is a wasteful number, since it uses less digits than its factorization.

561665222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280832613.

The product of its digits is 43200, while the sum is 35.

The square root of 561665222 is about 23699.4772516189. The cubic root of 561665222 is about 825.0732580187.

The spelling of 561665222 in words is "five hundred sixty-one million, six hundred sixty-five thousand, two hundred twenty-two".