163221231533 has 2 divisors, whose sum is σ = 163221231534. Its totient is φ = 163221231532.

The previous prime is 163221231449. The next prime is 163221231539. The reversal of 163221231533 is 335132122361.

163221231533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110209392484 + 53011839049 = 331978^2 + 230243^2 .

It is a cyclic number.

It is not a de Polignac number, because 163221231533 - 2¹² = 163221227437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163221231533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163221231539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81610615766 + 81610615767.

It is an arithmetic number, because the mean of its divisors is an integer number (81610615767).

Almost surely, 2^163221231533 is an apocalyptic number.

It is an amenable number.

163221231533 is a deficient number, since it is larger than the sum of its proper divisors (1).

163221231533 is an equidigital number, since it uses as much as digits as its factorization.

163221231533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 32.

Adding to 163221231533 its reverse (335132122361), we get a palindrome (498353353894).

The spelling of 163221231533 in words is "one hundred sixty-three billion, two hundred twenty-one million, two hundred thirty-one thousand, five hundred thirty-three".