563645661 has 8 divisors (see below), whose sum is σ = 751726080. Its totient is φ = 375664512.

The previous prime is 563645651. The next prime is 563645669. The reversal of 563645661 is 166546365.

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

It is not a de Polignac number, because 563645661 - 2⁶ = 563645597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563645669) 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, 10365 + ... + 35138.

It is an arithmetic number, because the mean of its divisors is an integer number (93965760).

Almost surely, 2^563645661 is an apocalyptic number.

It is an amenable number.

563645661 is a deficient number, since it is larger than the sum of its proper divisors (188080419).

563645661 is a wasteful number, since it uses less digits than its factorization.

563645661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49635.

The product of its digits is 388800, while the sum is 42.

The square root of 563645661 is about 23741.2228202340. Note that the first 3 decimals coincide. The cubic root of 563645661 is about 826.0418602138.

The spelling of 563645661 in words is "five hundred sixty-three million, six hundred forty-five thousand, six hundred sixty-one".