663563101 has 4 divisors (see below), whose sum is σ = 663651100. Its totient is φ = 663475104.

The previous prime is 663563099. The next prime is 663563111. The reversal of 663563101 is 101365366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201356100 + 462207001 = 14190^2 + 21499^2 .

It is a cyclic number.

It is not a de Polignac number, because 663563101 - 2¹ = 663563099 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 (663563111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31506 + ... + 48163.

It is an arithmetic number, because the mean of its divisors is an integer number (165912775).

Almost surely, 2^663563101 is an apocalyptic number.

It is an amenable number.

663563101 is a deficient number, since it is larger than the sum of its proper divisors (87999).

663563101 is an equidigital number, since it uses as much as digits as its factorization.

663563101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87998.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 663563101 is about 25759.7185737733. The cubic root of 663563101 is about 872.2227485021. Note that the first 3 decimals are identical.

The spelling of 663563101 in words is "six hundred sixty-three million, five hundred sixty-three thousand, one hundred one".