163978825 has 6 divisors (see below), whose sum is σ = 203333774. Its totient is φ = 131183040.

The previous prime is 163978819. The next prime is 163978849. The reversal of 163978825 is 528879361.

It can be written as a sum of positive squares in 3 ways, for example, as 2663424 + 161315401 = 1632^2 + 12701^2 .

It is not a de Polignac number, because 163978825 - 2¹¹ = 163976777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3279552 + ... + 3279601.

Almost surely, 2^163978825 is an apocalyptic number.

It is an amenable number.

163978825 is a deficient number, since it is larger than the sum of its proper divisors (39354949).

163978825 is an equidigital number, since it uses as much as digits as its factorization.

163978825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559163 (or 6559158 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 163978825 is about 12805.4217033255. The cubic root of 163978825 is about 547.3468084018.

The spelling of 163978825 in words is "one hundred sixty-three million, nine hundred seventy-eight thousand, eight hundred twenty-five".