2001335563 has 2 divisors, whose sum is σ = 2001335564. Its totient is φ = 2001335562.

The previous prime is 2001335537. The next prime is 2001335579. The reversal of 2001335563 is 3655331002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001335563 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001335263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000667781 + 1000667782.

It is an arithmetic number, because the mean of its divisors is an integer number (1000667782).

Almost surely, 2^2001335563 is an apocalyptic number.

2001335563 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001335563 is an equidigital number, since it uses as much as digits as its factorization.

2001335563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 2001335563 is about 44736.2891062725. The cubic root of 2001335563 is about 1260.2014381476.

Adding to 2001335563 its reverse (3655331002), we get a palindrome (5656666565).

The spelling of 2001335563 in words is "two billion, one million, three hundred thirty-five thousand, five hundred sixty-three".