561263866 has 8 divisors (see below), whose sum is σ = 869053824. Its totient is φ = 271579260.

The previous prime is 561263863. The next prime is 561263887. The reversal of 561263866 is 668362165.

561263866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (561263863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4526260 + ... + 4526383.

It is an arithmetic number, because the mean of its divisors is an integer number (108631728).

Almost surely, 2^561263866 is an apocalyptic number.

561263866 is a deficient number, since it is larger than the sum of its proper divisors (307789958).

561263866 is a wasteful number, since it uses less digits than its factorization.

561263866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9052676.

The product of its digits is 311040, while the sum is 43.

The square root of 561263866 is about 23691.0081254471. The cubic root of 561263866 is about 824.8766836191.

The spelling of 561263866 in words is "five hundred sixty-one million, two hundred sixty-three thousand, eight hundred sixty-six".