163799563549 has 2 divisors, whose sum is σ = 163799563550. Its totient is φ = 163799563548.

The previous prime is 163799563537. The next prime is 163799563591. The reversal of 163799563549 is 945365997361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129443087524 + 34356476025 = 359782^2 + 185355^2 .

It is a cyclic number.

It is not a de Polignac number, because 163799563549 - 2¹³ = 163799555357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163799563349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81899781774 + 81899781775.

It is an arithmetic number, because the mean of its divisors is an integer number (81899781775).

Almost surely, 2^163799563549 is an apocalyptic number.

It is an amenable number.

163799563549 is a deficient number, since it is larger than the sum of its proper divisors (1).

163799563549 is an equidigital number, since it uses as much as digits as its factorization.

163799563549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165337200, while the sum is 67.

The spelling of 163799563549 in words is "one hundred sixty-three billion, seven hundred ninety-nine million, five hundred sixty-three thousand, five hundred forty-nine".