561377266 has 8 divisors (see below), whose sum is σ = 855870444. Its totient is φ = 276087120.

The previous prime is 561377263. The next prime is 561377279. The reversal of 561377266 is 662773165.

It can be written as a sum of positive squares in 2 ways, for example, as 424978225 + 136399041 = 20615^2 + 11679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (561377263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2300605 + ... + 2300848.

Almost surely, 2^561377266 is an apocalyptic number.

561377266 is a deficient number, since it is larger than the sum of its proper divisors (294493178).

561377266 is a wasteful number, since it uses less digits than its factorization.

561377266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601516.

The product of its digits is 317520, while the sum is 43.

The square root of 561377266 is about 23693.4013176665. The cubic root of 561377266 is about 824.9322336747.

The spelling of 561377266 in words is "five hundred sixty-one million, three hundred seventy-seven thousand, two hundred sixty-six".