20352135611663 has 4 divisors (see below), whose sum is σ = 20825441091048. Its totient is φ = 19878830132280.

The previous prime is 20352135611657. The next prime is 20352135611707. The reversal of 20352135611663 is 36611653125302.

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

It is a cyclic number.

It is not a de Polignac number, because 20352135611663 - 2⁸ = 20352135611407 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 (20352135611653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236652739628 + ... + 236652739713.

It is an arithmetic number, because the mean of its divisors is an integer number (5206360272762).

Almost surely, 2^{20352135611663} is an apocalyptic number.

20352135611663 is a deficient number, since it is larger than the sum of its proper divisors (473305479385).

20352135611663 is an equidigital number, since it uses as much as digits as its factorization.

20352135611663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473305479384.

The product of its (nonzero) digits is 583200, while the sum is 44.

Adding to 20352135611663 its reverse (36611653125302), we get a palindrome (56963788736965).

The spelling of 20352135611663 in words is "twenty trillion, three hundred fifty-two billion, one hundred thirty-five million, six hundred eleven thousand, six hundred sixty-three".