1563666564 has 12 divisors (see below), whose sum is σ = 3648555344. Its totient is φ = 521222184.

The previous prime is 1563666539. The next prime is 1563666571. The reversal of 1563666564 is 4656663651.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65152762 + ... + 65152785.

Almost surely, 2^1563666564 is an apocalyptic number.

It is an amenable number.

1563666564 is an abundant number, since it is smaller than the sum of its proper divisors (2084888780).

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

1563666564 is a wasteful number, since it uses less digits than its factorization.

1563666564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130305554 (or 130305552 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The square root of 1563666564 is about 39543.2239960274. The cubic root of 1563666564 is about 1160.6859211206.

The spelling of 1563666564 in words is "one billion, five hundred sixty-three million, six hundred sixty-six thousand, five hundred sixty-four".