163665447 has 24 divisors (see below), whose sum is σ = 250303872. Its totient is φ = 94873680.

The previous prime is 163665419. The next prime is 163665451. The reversal of 163665447 is 744566361.

It is not a de Polignac number, because 163665447 - 2⁸ = 163665191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163665399 and 163665408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163665347) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1453 + ... + 18150.

It is an arithmetic number, because the mean of its divisors is an integer number (10429328).

Almost surely, 2^163665447 is an apocalyptic number.

163665447 is a deficient number, since it is larger than the sum of its proper divisors (86638425).

163665447 is a wasteful number, since it uses less digits than its factorization.

163665447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19651 (or 19640 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 163665447 is about 12793.1797063904. The cubic root of 163665447 is about 546.9979100371.

The spelling of 163665447 in words is "one hundred sixty-three million, six hundred sixty-five thousand, four hundred forty-seven".