163986723729 has 6 divisors (see below), whose sum is σ = 236869712066. Its totient is φ = 109324482480.

The previous prime is 163986723683. The next prime is 163986723737. The reversal of 163986723729 is 927327689361.

163986723729 is a `hidden beast` number, since 1 + 6 + 398 + 6 + 7 + 237 + 2 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163396233729 + 590490000 = 404223^2 + 24300^2 .

It is not a de Polignac number, because 163986723729 - 2⁸ = 163986723473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163986723779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9110373532 + ... + 9110373549.

Almost surely, 2^163986723729 is an apocalyptic number.

It is an amenable number.

163986723729 is a deficient number, since it is larger than the sum of its proper divisors (72882988337).

163986723729 is a wasteful number, since it uses less digits than its factorization.

163986723729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220747087 (or 18220747084 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 63.

The spelling of 163986723729 in words is "one hundred sixty-three billion, nine hundred eighty-six million, seven hundred twenty-three thousand, seven hundred twenty-nine".