1563866663 has 8 divisors (see below), whose sum is σ = 1587802608. Its totient is φ = 1539998784.

The previous prime is 1563866653. The next prime is 1563866671. The reversal of 1563866663 is 3666683651.

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

It is a cyclic number.

It is not a de Polignac number, because 1563866663 - 2⁶ = 1563866599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563866653) 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, 30281 + ... + 63597.

It is an arithmetic number, because the mean of its divisors is an integer number (198475326).

Almost surely, 2^1563866663 is an apocalyptic number.

1563866663 is a deficient number, since it is larger than the sum of its proper divisors (23935945).

1563866663 is an equidigital number, since it uses as much as digits as its factorization.

1563866663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34033.

The product of its digits is 2799360, while the sum is 50.

The square root of 1563866663 is about 39545.7540451564. The cubic root of 1563866663 is about 1160.7354291576.

The spelling of 1563866663 in words is "one billion, five hundred sixty-three million, eight hundred sixty-six thousand, six hundred sixty-three".