563646660 has 96 divisors (see below), whose sum is σ = 1604340864. Its totient is φ = 147840000.

The previous prime is 563646659. The next prime is 563646661. The reversal of 563646660 is 66646365.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (563646659) and next prime (563646661).

It is not an unprimeable number, because it can be changed into a prime (563646661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1702695 + ... + 1703025.

It is an arithmetic number, because the mean of its divisors is an integer number (16711884).

Almost surely, 2^563646660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 563646660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802170432).

563646660 is an abundant number, since it is smaller than the sum of its proper divisors (1040694204).

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

563646660 is a wasteful number, since it uses less digits than its factorization.

563646660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

The square root of 563646660 is about 23741.2438595791. The cubic root of 563646660 is about 826.0423482364.

The spelling of 563646660 in words is "five hundred sixty-three million, six hundred forty-six thousand, six hundred sixty".