163550441518421 has 2 divisors, whose sum is σ = 163550441518422. Its totient is φ = 163550441518420.

The previous prime is 163550441518393. The next prime is 163550441518447. The reversal of 163550441518421 is 124815144055361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157859473437796 + 5690968080625 = 12564214^2 + 2385575^2 .

It is an emirp because it is prime and its reverse (124815144055361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163550441518421 - 2⁶ = 163550441518357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163550441518421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163550441518621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81775220759210 + 81775220759211.

It is an arithmetic number, because the mean of its divisors is an integer number (81775220759211).

Almost surely, 2^{163550441518421} is an apocalyptic number.

It is an amenable number.

163550441518421 is a deficient number, since it is larger than the sum of its proper divisors (1).

163550441518421 is an equidigital number, since it uses as much as digits as its factorization.

163550441518421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304000, while the sum is 50.

The spelling of 163550441518421 in words is "one hundred sixty-three trillion, five hundred fifty billion, four hundred forty-one million, five hundred eighteen thousand, four hundred twenty-one".