663203105613 has 12 divisors (see below), whose sum is σ = 1014310632348. Its totient is φ = 416127438720.

The previous prime is 663203105561. The next prime is 663203105633. The reversal of 663203105613 is 316501302366.

663203105613 is a `hidden beast` number, since 6 + 6 + 3 + 2 + 0 + 31 + 0 + 5 + 613 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 187872834249 + 475330271364 = 433443^2 + 689442^2 .

It is not a de Polignac number, because 663203105613 - 2²¹ = 663201008461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663203105633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2167330258 + ... + 2167330563.

It is an arithmetic number, because the mean of its divisors is an integer number (84525886029).

Almost surely, 2^663203105613 is an apocalyptic number.

It is an amenable number.

663203105613 is a deficient number, since it is larger than the sum of its proper divisors (351107526735).

663203105613 is a wasteful number, since it uses less digits than its factorization.

663203105613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334660844 (or 4334660841 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

Adding to 663203105613 its reverse (316501302366), we get a palindrome (979704407979).

The spelling of 663203105613 in words is "six hundred sixty-three billion, two hundred three million, one hundred five thousand, six hundred thirteen".