163961856 has 66 divisors (see below), whose sum is σ = 473462912. Its totient is φ = 54650880.

The previous prime is 163961801. The next prime is 163961857. The reversal of 163961856 is 658169361.

163961856 is a `hidden beast` number, since 1 + 639 + 6 + 1 + 8 + 5 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163961857) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 321 + ... + 18111.

Almost surely, 2^163961856 is an apocalyptic number.

163961856 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 163961856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236731456).

163961856 is an abundant number, since it is smaller than the sum of its proper divisors (309501056).

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

163961856 is a wasteful number, since it uses less digits than its factorization.

163961856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17817 (or 17796 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 163961856 is about 12804.7591152665. The cubic root of 163961856 is about 547.3279274103.

The spelling of 163961856 in words is "one hundred sixty-three million, nine hundred sixty-one thousand, eight hundred fifty-six".