163364025535021 has 2 divisors, whose sum is σ = 163364025535022. Its totient is φ = 163364025535020.

The previous prime is 163364025535019. The next prime is 163364025535049. The reversal of 163364025535021 is 120535520463361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102645488850921 + 60718536684100 = 10131411^2 + 7792210^2 .

It is an emirp because it is prime and its reverse (120535520463361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163364025535021 - 2¹ = 163364025535019 is a prime.

Together with 163364025535019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163364025535721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81682012767510 + 81682012767511.

It is an arithmetic number, because the mean of its divisors is an integer number (81682012767511).

Almost surely, 2^{163364025535021} is an apocalyptic number.

It is an amenable number.

163364025535021 is a deficient number, since it is larger than the sum of its proper divisors (1).

163364025535021 is an equidigital number, since it uses as much as digits as its factorization.

163364025535021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 46.

Adding to 163364025535021 its reverse (120535520463361), we get a palindrome (283899545998382).

The spelling of 163364025535021 in words is "one hundred sixty-three trillion, three hundred sixty-four billion, twenty-five million, five hundred thirty-five thousand, twenty-one".