163865144 has 16 divisors (see below), whose sum is σ = 311457120. Its totient is φ = 80809920.

The previous prime is 163865137. The next prime is 163865173. The reversal of 163865144 is 441568361.

It is a junction number, because it is equal to n+sod(n) for n = 163865098 and 163865107.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 139712 + ... + 140879.

It is an arithmetic number, because the mean of its divisors is an integer number (19466070).

Almost surely, 2^163865144 is an apocalyptic number.

It is an amenable number.

163865144 is a deficient number, since it is larger than the sum of its proper divisors (147591976).

163865144 is a wasteful number, since it uses less digits than its factorization.

163865144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280670 (or 280666 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 163865144 is about 12800.9821498196. The cubic root of 163865144 is about 547.2202934547.

The spelling of 163865144 in words is "one hundred sixty-three million, eight hundred sixty-five thousand, one hundred forty-four".