163557216 has 72 divisors (see below), whose sum is σ = 481178880. Its totient is φ = 52636416.

The previous prime is 163557203. The next prime is 163557239. The reversal of 163557216 is 612755361.

163557216 is a `hidden beast` number, since 1 + 635 + 5 + 7 + 2 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1440 + ... + 18143.

It is an arithmetic number, because the mean of its divisors is an integer number (6683040).

Almost surely, 2^163557216 is an apocalyptic number.

163557216 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 163557216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240589440).

163557216 is an abundant number, since it is smaller than the sum of its proper divisors (317621664).

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

163557216 is a wasteful number, since it uses less digits than its factorization.

163557216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19628 (or 19617 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 163557216 is about 12788.9489794901. The cubic root of 163557216 is about 546.8773079456.

The spelling of 163557216 in words is "one hundred sixty-three million, five hundred fifty-seven thousand, two hundred sixteen".