163138979281 has 2 divisors, whose sum is σ = 163138979282. Its totient is φ = 163138979280.

The previous prime is 163138979257. The next prime is 163138979329. The reversal of 163138979281 is 182979831361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88084897681 + 75054081600 = 296791^2 + 273960^2 .

It is a cyclic number.

It is not a de Polignac number, because 163138979281 - 2⁵ = 163138979249 is a prime.

It is a super-2 number, since 2×163138979281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163138979221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81569489640 + 81569489641.

It is an arithmetic number, because the mean of its divisors is an integer number (81569489641).

Almost surely, 2^163138979281 is an apocalyptic number.

It is an amenable number.

163138979281 is a deficient number, since it is larger than the sum of its proper divisors (1).

163138979281 is an equidigital number, since it uses as much as digits as its factorization.

163138979281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The spelling of 163138979281 in words is "one hundred sixty-three billion, one hundred thirty-eight million, nine hundred seventy-nine thousand, two hundred eighty-one".