163997825 has 12 divisors (see below), whose sum is σ = 203727660. Its totient is φ = 130959360.

The previous prime is 163997819. The next prime is 163997839. The reversal of 163997825 is 528799361.

It can be written as a sum of positive squares in 6 ways, for example, as 9840769 + 154157056 = 3137^2 + 12416^2 .

It is not a de Polignac number, because 163997825 - 2⁴ = 163997809 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8741 + ... + 20109.

It is an arithmetic number, because the mean of its divisors is an integer number (16977305).

Almost surely, 2^163997825 is an apocalyptic number.

It is an amenable number.

163997825 is a deficient number, since it is larger than the sum of its proper divisors (39729835).

163997825 is a wasteful number, since it uses less digits than its factorization.

163997825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11956 (or 11951 counting only the distinct ones).

The product of its digits is 816480, while the sum is 50.

The square root of 163997825 is about 12806.1635551011. The cubic root of 163997825 is about 547.3679476916.

The spelling of 163997825 in words is "one hundred sixty-three million, nine hundred ninety-seven thousand, eight hundred twenty-five".