21663365133563 has 8 divisors (see below), whose sum is σ = 21673481380848. Its totient is φ = 21653249645664.

The previous prime is 21663365133539. The next prime is 21663365133607. The reversal of 21663365133563 is 36533156336612.

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 21663365133563 - 2⁶ = 21663365133499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21663365133763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61534145 + ... + 61885197.

It is an arithmetic number, because the mean of its divisors is an integer number (2709185172606).

Almost surely, 2^{21663365133563} is an apocalyptic number.

21663365133563 is a deficient number, since it is larger than the sum of its proper divisors (10116247285).

21663365133563 is a wasteful number, since it uses less digits than its factorization.

21663365133563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379693.

The product of its digits is 15746400, while the sum is 53.

The spelling of 21663365133563 in words is "twenty-one trillion, six hundred sixty-three billion, three hundred sixty-five million, one hundred thirty-three thousand, five hundred sixty-three".