563943666 has 64 divisors (see below), whose sum is σ = 1341204480. Its totient is φ = 155826240.

The previous prime is 563943659. The next prime is 563943671. The reversal of 563943666 is 666349365.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67255 + ... + 75173.

It is an arithmetic number, because the mean of its divisors is an integer number (20956320).

Almost surely, 2^563943666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 563943666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670602240).

563943666 is an abundant number, since it is smaller than the sum of its proper divisors (777260814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

563943666 is a wasteful number, since it uses less digits than its factorization.

563943666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031.

The product of its digits is 2099520, while the sum is 48.

The square root of 563943666 is about 23747.4980997999. The cubic root of 563943666 is about 826.1874133814.

The spelling of 563943666 in words is "five hundred sixty-three million, nine hundred forty-three thousand, six hundred sixty-six".