163241991817 has 2 divisors, whose sum is σ = 163241991818. Its totient is φ = 163241991816.

The previous prime is 163241991811. The next prime is 163241991851. The reversal of 163241991817 is 718199142361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115803409401 + 47438582416 = 340299^2 + 217804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163241991817 is a prime.

It is a super-2 number, since 2×163241991817² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163241991811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81620995908 + 81620995909.

It is an arithmetic number, because the mean of its divisors is an integer number (81620995909).

Almost surely, 2^163241991817 is an apocalyptic number.

It is an amenable number.

163241991817 is a deficient number, since it is larger than the sum of its proper divisors (1).

163241991817 is an equidigital number, since it uses as much as digits as its factorization.

163241991817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 52.

The spelling of 163241991817 in words is "one hundred sixty-three billion, two hundred forty-one million, nine hundred ninety-one thousand, eight hundred seventeen".