163321520863 has 4 divisors (see below), whose sum is σ = 163648819000. Its totient is φ = 162994222728.

The previous prime is 163321520779. The next prime is 163321520909. The reversal of 163321520863 is 368025123361.

163321520863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 163321520863 - 2²¹ = 163319423711 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 (163321520563) 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 in 3 ways as a sum of consecutive naturals, for example, 163648320 + ... + 163649317.

It is an arithmetic number, because the mean of its divisors is an integer number (40912204750).

Almost surely, 2^163321520863 is an apocalyptic number.

163321520863 is a deficient number, since it is larger than the sum of its proper divisors (327298137).

163321520863 is an equidigital number, since it uses as much as digits as its factorization.

163321520863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327298136.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 163321520863 in words is "one hundred sixty-three billion, three hundred twenty-one million, five hundred twenty thousand, eight hundred sixty-three".