163971216 has 100 divisors (see below), whose sum is σ = 499633200. Its totient is φ = 51772608.

The previous prime is 163971193. The next prime is 163971229. The reversal of 163971216 is 612179361.

163971216 is a `hidden beast` number, since 1 + 639 + 7 + 1 + 2 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21295 + ... + 27953.

It is an arithmetic number, because the mean of its divisors is an integer number (4996332).

Almost surely, 2^163971216 is an apocalyptic number.

163971216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163971216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249816600).

163971216 is an abundant number, since it is smaller than the sum of its proper divisors (335661984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163971216 is a wasteful number, since it uses less digits than its factorization.

163971216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698 (or 6683 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 163971216 is about 12805.1245991595. The cubic root of 163971216 is about 547.3383422146.

The spelling of 163971216 in words is "one hundred sixty-three million, nine hundred seventy-one thousand, two hundred sixteen".