163881718841 has 4 divisors (see below), whose sum is σ = 164787142884. Its totient is φ = 162976294800.

The previous prime is 163881718811. The next prime is 163881718849. The reversal of 163881718841 is 148817188361.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26952117241 + 136929601600 = 164171^2 + 370040^2 .

It is a cyclic number.

It is not a de Polignac number, because 163881718841 - 2²⁶ = 163814609977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163881718849) 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, 452711750 + ... + 452712111.

It is an arithmetic number, because the mean of its divisors is an integer number (41196785721).

Almost surely, 2^163881718841 is an apocalyptic number.

It is an amenable number.

163881718841 is a deficient number, since it is larger than the sum of its proper divisors (905424043).

163881718841 is an equidigital number, since it uses as much as digits as its factorization.

163881718841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905424042.

The product of its digits is 2064384, while the sum is 56.

The spelling of 163881718841 in words is "one hundred sixty-three billion, eight hundred eighty-one million, seven hundred eighteen thousand, eight hundred forty-one".