163921616 has 40 divisors (see below), whose sum is σ = 339603264. Its totient is φ = 76377600.

The previous prime is 163921613. The next prime is 163921643. The reversal of 163921616 is 616129361.

163921616 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163921613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25091 + ... + 30941.

Almost surely, 2^163921616 is an apocalyptic number.

163921616 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 163921616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169801632).

163921616 is an abundant number, since it is smaller than the sum of its proper divisors (175681648).

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

163921616 is a wasteful number, since it uses less digits than its factorization.

163921616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5979 (or 5973 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 163921616 is about 12803.1877280621. The cubic root of 163921616 is about 547.2831481379.

The spelling of 163921616 in words is "one hundred sixty-three million, nine hundred twenty-one thousand, six hundred sixteen".