561813266 has 16 divisors (see below), whose sum is σ = 967432704. Its totient is φ = 239696064.

The previous prime is 561813253. The next prime is 561813269. The reversal of 561813266 is 662318165.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561813269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86855 + ... + 93098.

It is an arithmetic number, because the mean of its divisors is an integer number (60464544).

Almost surely, 2^561813266 is an apocalyptic number.

561813266 is a deficient number, since it is larger than the sum of its proper divisors (405619438).

561813266 is a wasteful number, since it uses less digits than its factorization.

561813266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180185.

The product of its digits is 51840, while the sum is 38.

The square root of 561813266 is about 23702.6004058626. The cubic root of 561813266 is about 825.1457427245.

The spelling of 561813266 in words is "five hundred sixty-one million, eight hundred thirteen thousand, two hundred sixty-six".