561366266 has 4 divisors (see below), whose sum is σ = 842049402. Its totient is φ = 280683132.

The previous prime is 561366263. The next prime is 561366293. The reversal of 561366266 is 662663165.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 514155625 + 47210641 = 22675^2 + 6871^2 .

It is not an unprimeable number, because it can be changed into a prime (561366263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140341565 + ... + 140341568.

Almost surely, 2^561366266 is an apocalyptic number.

561366266 is a deficient number, since it is larger than the sum of its proper divisors (280683136).

561366266 is a wasteful number, since it uses less digits than its factorization.

561366266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280683135.

The product of its digits is 233280, while the sum is 41.

The square root of 561366266 is about 23693.1691843873. The cubic root of 561366266 is about 824.9268455489.

The spelling of 561366266 in words is "five hundred sixty-one million, three hundred sixty-six thousand, two hundred sixty-six".